Malicious PDF — malware analysis report

Static analysis result for SHA-256 3934dfda0360fe5e…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 21:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 096900517784448e0ac0a8894a374ee3 SHA-1: 1ba4c66253f4e667d03302ad004e66733c6bae95 SHA-256: 3934dfda0360fe5e2dfc8db813d8f40fdf382615b8c8be0a9bde5789d96ecdc6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to the linked URLs, suggesting a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=circulatory+system+of+herdmania+pdf
    • https://cdn.sqhk.co/zanotunuzi/jhhjcic/gebalagofonoxutaz.pdf
    • https://texapusozos.weebly.com/uploads/1/3/1/4/131407592/9258b1632be9a.pdf
    • https://cdn-cms.f-static.net/uploads/4482623/normal_603cb1c9c4bfe.pdf
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fd76c8c66338.pdf
    • https://cdn-cms.f-static.net/uploads/4415518/normal_604647c7423cb.pdf
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5ff9de82cc7af.pdf
    • https://cdn-cms.f-static.net/uploads/4455894/normal_603ba37533fa8.pdf
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/1715795.pdf
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/sovepizoz.pdf
    • https://cdn.sqhk.co/bapisolel/4mtd6hf/19356669420.pdf
    • https://cdn-cms.f-static.net/uploads/4406454/normal_6040ffc2834fc.pdf
    • https://widoripitobagat.weebly.com/uploads/1/3/4/8/134882637/tijugogukazatogad.pdf
    • https://cdn-cms.f-static.net/uploads/4421042/normal_602e44da020e3.pdf
    • http://sbrf.link/xepozobqe11.pdf
    • https://cdn.sqhk.co/nazujovo/yjjtijd/escape_from_tarkov_lab_key_arsenal_storage_room.pdf
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe6bf0ab44f2.pdf
    • http://milanbeach.fun/femesokizapevnzuax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mefonevimimix/password_keeper_free_template.pdf
    • https://s3.amazonaws.com/feseni/wogesavajowajumirixusova.pdf
    • https://s3.amazonaws.com/tigewibejageju/birigufakexipaguk.pdf
    • https://s3.amazonaws.com/daxemo/lagav.pdf
    • 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_off0000e982.bin
476609fd1dc43093a78cfa42758cafbaaf932cf418fa52004272711dcf2e495e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 5404 bytes
font_01_sfnt_off0000fbbd.bin
90cca40c17520d711efc33fa5faaeaa0f8209e17f7f3cd103c270a54d6e8bd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 9936 bytes

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