Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd717ffc44bc29f…

MALICIOUS

PDF

102.2 KB Created: 2021-03-17 15:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b0ccc0022c74f3f9f29c2ad19a70b18 SHA-1: 1aa6a5bd3121b903a462aba89584ad3456993061 SHA-256: ecd717ffc44bc29fa445cd0cfeacd7361a089e3e93ec43ef8df0ee9b02ed9e94
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://golowaki.ru/123?utm_term=types+of+antibodies+and+their+function+pdf PDF link annotation
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/ninuzuxij.pdfIn PDF document text
    • http://domsale.xyz/green_bed_sheets_ukms8rz.pdfIn PDF document text
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/votonevumiba-vijajodupire-veduxakisusoved.pdfIn PDF document text
    • https://lebotowim.weebly.com/uploads/1/3/1/4/131438344/2522269.pdfIn PDF document text
    • http://lunesygets.xyz/29170542527t7jhj.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/361182281315qv2n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/79894500395.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/71313751275.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/wokibufeminuganuzopor.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_025ab4e9acc6453095cc88fe4b979539.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/semurutadum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f2f78b-c83d-43db-8e1a-48866dd732ec/balancing_chemical_equations_practice_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/charterers_p_i_proposal_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c911271-b06a-4ec8-bf68-66c8f8e9dae2/codigo_ascii_para_cerrar_signo_de_interrogacion.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/figubuzisusefumufufon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d11a9af-ede6-4f3b-99e4-f9776c4b2f47/ipod_nano_6th_generation_does_not_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/non_governmental_organizations_list.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/nipolutofilumujader.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_0e0704fda90e4e3b82667f12c4868340.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_25927b9bf2a9495eb9fed6c443d873ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/eular_guidelines_gout_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441854b3-1f25-45a4-be92-1d61065beb28/the_prince_and_the_guard_kiera_cass_summary.pdfIn 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_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 5404 bytes
SHA-256: 54852ebc9948a689ad0e6769f07fe9af9579ecc9cd054e674c08ce82beaf77cb
font_01_sfnt_off000162c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C0 11556 bytes
SHA-256: 4e4cc686b22ad3366a37db6a4121e469101125eba523178b92d0717f19237e5f

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