Malicious PDF — malware analysis report

Static analysis result for SHA-256 936df4fd65e66caa…

MALICIOUS

PDF

80.6 KB Created: 2021-03-15 22:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 273b8cae169af55a7995263652efa6ef SHA-1: 22f79c6eee7e1d49e01486c35e60c97abe80ab60 SHA-256: 936df4fd65e66caab29236e28745edfbd7595ead82982ba772183ab71db54b30
284 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF containing numerous embedded links, many of which point to potentially malicious redirectors or disposable hosting, as indicated by heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM. The SE_PAYMENT_REDIRECT_LURE heuristic strongly suggests a business-email-compromise or financial phishing attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to distribute malware or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wix?keyword=moviebox+apk+file In PDF document text
    • http://kavelizopepi.mywebcommunity.org/malonunukoturuwoge.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/hhgcMjg/51986837687.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/Xjhhihb/porterville_sheltered_workshop_copy_center.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/Sbgiehf/godikanujis.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/cxUtyAy/metal_slug_attack_mod_apk_2020.pdfIn PDF document text
    • http://paselon.getenjoyment.net/64647762632.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/10094732541.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/gi9jbUu/7026791135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/433db0b9-a3fc-457d-b4bc-4ea82ea91181/msi_h81m-e33_front_panel_connectors.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_e4005b4de71447919ae23652677281f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/909c5daf-baa7-4960-82e0-f9b4dd78e684/king_henry_died_by_drinking_chocolate_milk_worksheet.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_8292543946d34b56b6e511f98f9dd766.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_b0ee6cd37b46474aae763444100178a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edb986d-0f04-4ef3-b598-7d8c48bcdd64/92856891627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850bf966-7d3e-48a7-9677-3f5b73ea639b/how_can_i_be_a_good_student_paragraph.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_0a5da8dc3adf412f9683889daea57522.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7124cc9-fc92-48fe-beee-c733a0a0cc98/zisuwuvubororogibaki.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_79b7512efc464c1ba840e3701821af9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49767eca-39f3-453d-9aef-e8fa2880558a/62429762156.pdfIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_2df8072402274d42a8f5efd6d208bf31.pdf?index=trueIn PDF document text
    • http://bagugexasorip.myartsonline.com/12535133443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98dc7c53-2bf3-4fc0-a179-b2a6d11d151e/fodaxalu.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/wimpy_kid_book_in_order.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_a9ebac05a9854334bd1a67f5791cca21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5a8ef9-52a6-4971-81de-96a4b08150de/how_to_get_a_seminary_degree.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_a0b4494179c244cea2fc40dfce51d7d6.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_cd00d0a9d089476cabf05f89f67bff94.pdf?index=trueIn PDF document text
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_325a43e8ff42453ba8fcf1d454403a22.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 4960 bytes
SHA-256: 5c165def781d161f0f3cee5bf45ff3d51d7e5c2cbeb290b4cae8eff51f2e9da7
font_01_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 11280 bytes
SHA-256: da4b2f28ae18340c284d736117236798c3e4c3c598cf479010d921fe20598997

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