Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe6f00afbf77560…

MALICIOUS

PDF

71.7 KB Created: 2021-05-19 16:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2fc31e08b64bab8e954768b9ccb998e2 SHA-1: 447c05fe456d35d5865eb4d2d9afd6658fa0e9c7 SHA-256: 4fe6f00afbf775604c251b98540254f898e1162be5fc6684d6567dd42cd241f3
186 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 6

  • 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.
  • 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://dafemum.ru/wb?keyword=how%20to%20descale%20keurig%20with%20white%20vinegar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489240/normal_6059e991a7f9b.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/xitibenada_bodalosekuxale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_602b76c46c4c7.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/e7941e8f51fe2c.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/9717727.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/4416661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_5fe8179b29831.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/vugowasusabofat-jidimiloxu-lelusupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff416d9c94fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_604aa77482a14.pdfIn PDF document text
    • https://dinorega.weebly.com/uploads/1/3/3/9/133999175/loterakagopopog_rapebatosig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420748/normal_5feb6b6c887c3.pdfIn PDF document text
    • https://zejatuno.weebly.com/uploads/1/3/0/7/130776413/zelepanunulozo-gefexab-nulirusufofuk.pdfIn PDF document text
    • https://sisexalixigana.weebly.com/uploads/1/3/5/3/135323773/ae57797acc3d.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/c48c6ce77.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/peveziwoguxuzam/24938692243.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/the_darkest_minds_hardback.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_off0000dca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA5 5376 bytes
SHA-256: 222c98797ebdacb08f317285e2eed0fb95f07a54e170ecc02b6879f486958008
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 10192 bytes
SHA-256: 693da4aa0b7ff21b1b3b188b96c8a6b2a40b8d58b7247ac055d28be2ef02213d

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