Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c9cc5f5ed2abd4…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 20:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8bb0e0335d1ec7f86ef32cf3f393cf68 SHA-1: 8039f18632f9ca5cecaf7f4aceaf002d387b6a35 SHA-256: 40c9cc5f5ed2abd4d8bb6cde7b18153624e7b5e237dc6905622723426db4a4a2
186 Risk Score

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 0.9996

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://lozipotod.ru/aws?utm_term=how+to+describe+your+company+culture PDF link annotation
    • https://cdn.sqhk.co/xefilelo/Wz5hi93/mowixazuviduzosasaxivovep.pdfIn PDF document text
    • https://tasepatoravolun.weebly.com/uploads/1/3/4/3/134352318/ccdd9d13.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hc4iahj/piwemezu.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/e8v4ihu/movie_box_ios_jailbreak.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/jeAqeo7/durizuk.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/Otdjejh/computer_virus_game_lsat.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/1521913.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/ihcKDhb/panomoluwoz.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzivogawa/gghhhbQ/gujowojikixunusedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_08510bbf82e947b2898a90b69bc62cfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/simajoxawabatuzem.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_93327658a63c4a29bc8a1b0fe25cd0a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/fesaloruwoxegonapem.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_74eef30bd8fa44209d3ec6423c7a9f55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/get_math_answers_with_steps.pdfIn PDF document text
    • https://ae40ec61-d20a-40a8-9c94-208d4569f534.filesusr.com/ugd/5d0862_5b09b5ecc612433d8eef3a36c7204f70.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_11d3a6fa4afa433da967846087aa4f89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/black_panther_film_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/fusodekawegariduvagupuz.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_0cff52c466604d6eaccdd8cdb6cb6dfc.pdf?index=trueIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_51df75d3b92b4be59e8919862347e37b.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_7c1c8fae6c704b62bd1a71a707af8faa.pdf?index=trueIn 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_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 5512 bytes
SHA-256: fcb8d238362cddd9e624d27e6a4992896c174c6665f67e4bca9b231840cb7018
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 10448 bytes
SHA-256: 0d5dd23d683680786ffb9e390df7b5bc30c82b15fada49c4f8f445ff49e10163