Malicious PDF — malware analysis report

Static analysis result for SHA-256 168bad78b9dc5af1…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 07:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fd7762706b05ae3d3a2f8cd7c5501229 SHA-1: c72176259a0361686e7cee3cb942e65612b96c29 SHA-256: 168bad78b9dc5af13dc6c063cd7b7135fdaa12c2e1bf96610e08423bdcfe23a4
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack, likely intended to deliver a secondary payload or lead the user to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://dafemum.ru/award?keyword=sololearn+c+pdf In PDF document text
    • http://nebuxopav.mypressonline.com/linux_shell_scripting_tutorial_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473963/normal_5ffc7472a24a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367937/normal_600583c083b6a.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/wing_chun_classes_for_adults_near_me.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/91106329487.pdfIn PDF document text
    • http://bewelaxoludiw.22web.org/hernias_da_parede_abdominal.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/basic_english_phrases.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/litexowovuxodidiwiribus.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/6b7c3758-5d3c-4e73-9a91-731a51d7161c/trigonometric_formulas.pdfIn PDF document text
    • http://xojabujujipeze.rf.gd/31763866989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99350f4-e945-4845-8c82-7573f0fb5644/83761400147.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_25a0dfe20d614e2ca4a17bbf56704a7b.pdf?index=trueIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/is_genie_2_worth_it.pdfIn PDF document text
    • http://tizepadeda.rf.gd/gst_all_information_in_gujarati.pdfIn PDF document text
    • http://pikizopesoru.rf.gd/10561179213.pdfIn PDF document text
    • http://noroved.myartsonline.com/84900036717.pdfIn PDF document text
    • https://1d20f49f-ccd6-4d05-b9af-9ecc574be1a3.filesusr.com/ugd/7b50d7_81af31442fd24c438de7091a9174bd86.pdf?index=trueIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_5fc257b982934e56907df87423b36444.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce07a278-f6ac-49ec-a6ff-79bf0f84e554/sulexabexulavibosiseti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07472755-45b9-4e55-a586-b09f349b8b4e/46673252008.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_675000d3e3254559813be606962ee9ea.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_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 5072 bytes
SHA-256: b19a5c35f2d1e4de813e0c2593e21c44871bd4f6c964bd6d37bfe387ea4d2500
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 10944 bytes
SHA-256: b71ee4d0a260f7b616d1c7d3d65c94e38912b3644f5c08e82cc99c221a576d68

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