Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4462b5f4b3d72c…

MALICIOUS

PDF

70.6 KB Created: 2021-02-28 04:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46f2d9578f97f2223b1fa8ba63e22545 SHA-1: 43de8eb854e7447e92e2738fa243af8ef94fc852 SHA-256: 0c4462b5f4b3d72c5ca828c9193d562f0dbd2b1db1e930382f92f7bbb7512b88
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links points towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/aws?utm_term=are+dunkin+donuts+corn+muffins+healthy
    • http://zatoboyvibor.fun/extra_deep_pocket_king_fitted_sheet4fqrx.pdf
    • https://cdn-cms.f-static.net/uploads/4488822/normal_600e650261d14.pdf
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/8894011.pdf
    • https://cdn-cms.f-static.net/uploads/4416669/normal_603639adc72e4.pdf
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/349730.pdf
    • http://profaudit32.ru/how_much_does_drivers_license_renewal_cost_in_mississippieeuwy.pdf
    • http://bnl-jobs.com/78905699861fkzmf.pdf
    • https://xalofaba.weebly.com/uploads/1/3/5/3/135339869/5f1bf2.pdf
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/e53e99152768f.pdf
    • http://wowitaly.pro/sekurojuworagonl2zuy.pdf
    • http://remont-kholodilnikov.website/gangster_dulhania_full_movie_bhojpuricfg91.pdf
    • https://bofetolukolun.weebly.com/uploads/1/3/4/0/134018575/49380.pdf
    • http://makamar.online/famejedegabukavubiwm1phk.pdf
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/jivobofoxekeled_suvew_zafumev.pdf
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5fe6560b9529f.pdf
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/9480162.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xelimewat/57488207702.pdf
    • https://s3.amazonaws.com/gosete/dlr_biographical_data_form.pdf
    • https://s3.amazonaws.com/foneniz/zelaritexasulamarug.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_off0000d6f2.bin
f0187d30ba519285b8aae2d94bb3ca25f2ab6b296cca2bdd0f570818d6d47598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 5416 bytes
font_01_sfnt_off0000e941.bin
c2cd127a73560bb61b53f96d4c7247c7bef354096d1857de3dc6656387584471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 10588 bytes

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