Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f60ff020d430c9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 06:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a917f329cf09d102a7addf893b925459 SHA-1: d8476c34fe0b1fc2532f27795bf8005e054e5098 SHA-256: b8f60ff020d430c97aa8758429b0c0f1b3c177934f8b1b333a4619da04711ff7
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 as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external URLs points towards the document's primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=calamari+inkantation+orchestra+sheet+music
    • https://cdn-cms.f-static.net/uploads/4418747/normal_60386baedb0b5.pdf
    • https://xizenajagixofus.weebly.com/uploads/1/3/4/6/134657686/lapejuxulis_zowakives.pdf
    • https://cdn-cms.f-static.net/uploads/4421641/normal_5fd0ec1f03cca.pdf
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/zilusovaruj.pdf
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/pegaruripute_jufuzero_kujosado_koxogefadebom.pdf
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/sosofe.pdf
    • https://cdn.sqhk.co/dojatejij/ig7cMgd/3888707176.pdf
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/dikefava.pdf
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/nemugijewidogev.pdf
    • https://virikewujolitof.weebly.com/uploads/1/3/2/7/132712461/sivedib-mifilen.pdf
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/6812939.pdf
    • https://cdn.sqhk.co/kuvuzebilet/qkLhdKP/making_cake_frosting_at_home.pdf
    • https://jalebipozufi.weebly.com/uploads/1/3/5/3/135320073/f77d484861d.pdf
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5fdbc76b083c2.pdf
    • https://tumenunomowet.weebly.com/uploads/1/3/0/7/130775025/d79e0.pdf
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/bewagejeto.pdf
    • https://wozaxopuvomu.weebly.com/uploads/1/3/0/7/130740129/degavukoj-soporu-ledewixupimuwob.pdf
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/japojo.pdf
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/7c1a276e0d618b9.pdf
    • https://nupepapuk.weebly.com/uploads/1/3/1/4/131484133/d74d8.pdf
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/wusezite-dobise.pdf
    • https://cdn-cms.f-static.net/uploads/4420237/normal_60540355bcaa7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee25.bin
6619af4723b3003795f54415e50536a003aa0fcf4a8ab368bb0fe135f1fbc5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5008 bytes
font_01_sfnt_off0000fefc.bin
2df7f71b12bce9e0b569e012a524b8a60e7e6ce81c8b5e957f5f66abb77d3cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10612 bytes

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