Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a7a5bc0007d0fd…

MALICIOUS

PDF

76.3 KB Created: 2020-11-19 18:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8172a88779d25c6704d936ba214d4d0e SHA-1: 125d57bbffbf9f6c38d284fe7b5b8f9ab3e51b75 SHA-256: c7a7a5bc0007d0fd3b123b33c2ba61d8b9df3c4a792dbe7da7fdb44ca465a668
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 0.9998

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://traffking.ru/123?utm_term=poweramp+apk+old+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f9d69f1d19c4.pdfIn PDF document text
    • https://wowomake.weebly.com/uploads/1/3/4/6/134679477/mogagakixoj_nibisazarile_zutaviwib_zivesoxizavi.pdfIn PDF document text
    • https://nexajatolotol.weebly.com/uploads/1/3/4/3/134308242/kabelanujopikuze.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/lolavedivekepafane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5fb3486ba15d7.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/2ef8772951d488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5fa657d575907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fa9c54bcabd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5f9ed1e27c697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f8d73fa393b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_5f9add462d285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9a874bf0-b839-4618-b4af-c2b97bfc3862/polug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe63ba43-e3de-4f5e-8d4b-01e8d1f6ef89/c_king_mng_sau_m_ci.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46788fe-5850-430f-9866-5a282af1dfa9/xekizif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 5028 bytes
SHA-256: e16806d23127de82dc679984bcd3d4aec0e2f388e33eca804c6fd659e676429a
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 13468 bytes
SHA-256: e7995d9227d3259cd93adf38ad6abeedca0e6448e0749ac03c0756ebc4caec7c
font_02_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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