Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c754a76f0b829a6…

MALICIOUS

PDF

74.7 KB Created: 2021-03-30 05:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8ebb249eac0b5bffc7f877c946e737a SHA-1: ee0f50a2020829c5725f54a4e67a63b23b7f808b SHA-256: 3c754a76f0b829a62941e621af808a6a8af5fd951360d5d4d7e84b9aa1ccf500
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. One of the embedded URLs, 'https://leonvi.ru/wix?keyword=admonishing+ray+pathfinder', is directly associated with this heuristic. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/wix?keyword=admonishing+ray+pathfinder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489240/normal_6048740c9ca2b.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/ruzujurok.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/92117737094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5ffbcad1d046b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_604069b708718.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5feb5db19c2ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fc7a11d9e103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd63bd5d400d.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/javukigidabomanakapogikeb.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/dojonuta/firefawikedafim.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/pufamexexakasufozewoke.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/56389621475.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_62d606b7353241ea98bc88ffb85c49c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukajevo/internet_speed_meter_apk_2019.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_342e776487a64bcbacadf4d20a883e19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/refuxexipivizewivejojijer.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_219c5c1709fa4d3092b02e6a4c169e61.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_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 5516 bytes
SHA-256: 0852c3760244752ca3fad6383c0d16f705bc677df89cf37d5b1b070cc00542f2
font_01_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 11148 bytes
SHA-256: 72419e78573e196e46fdb7bc5be825a181ce03d73de89ea0ee8017acfed1df22

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