Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dc3ef84a1cb6e0…

MALICIOUS

PDF

76.0 KB Created: 2021-02-26 01:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3b91f90e98f97b4f84ec563df3652f5f SHA-1: 881b4dddaac3d5c0d0b5777ba2c984265161c520 SHA-256: c8dc3ef84a1cb6e030bde722bf7f812d949a44fe0a761eec8f26b7b4c8c2edb3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://seumenha.ru/123?utm_term=one+summer+day+tab+pdf PDF link annotation
    • http://airet.space/96748310872l6su0.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/dizininowepokirome.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/5496694.pdfIn PDF document text
    • http://deemonatrafik.xyz/download_percy_jackson_and_the_battle_of_labyrinth7n1xu.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/5537778.pdfIn PDF document text
    • http://aycotoro6.xyz/zizojzbijq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_6000afdff1c44.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/713586d8e.pdfIn PDF document text
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/jupoxifenaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fe526a2b60fe.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/pinigaxazejatafob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fd5ff70e2a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fe60df87d012.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/solvency_and_liquidity_test_templatehzbvr.pdfIn PDF document text
    • https://terenedadobi.weebly.com/uploads/1/3/5/9/135961601/80c7d526ca8617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_60112d99cb59d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepufikegag.rf.gd/lifeline_laboratory_online_reports.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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 5424 bytes
SHA-256: 96a69945c1377e34bda5be93f360e902c5b460fec4d0c2820346942e072ed3fb
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11920 bytes
SHA-256: 7b9231e99719076023f1767f1bca0eedc2896ad01088fb7faf94c3c78d2df296

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