Malicious PDF — malware analysis report

Static analysis result for SHA-256 28de46829d3913bd…

MALICIOUS

PDF

71.2 KB Created: 2021-03-30 15:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24a8f9eadcf71acdaa391bb6e3988909 SHA-1: d7ca30b0c4209229a8c6135de0d47a8df36f8dd3 SHA-256: 28de46829d3913bd2530676ca118b17d7f5e0d5b978da868782d6f23c01baa46
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 PDF SEO link farm. One of the primary URLs points to 'seumenha.ru', which is suspicious. The ClamAV detection and ML classifier also indicate maliciousness, with ClamAV specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=rbi+baseball+16+apk+obb
    • http://verifiedbadge-lnstagram.com/sididavixibofakiu0w08.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5fe3b6f99e775.pdf
    • http://xasunibi.iblogger.org/basic_software_engineering_interview_questions_and_answers.pdf
    • http://futup.ru/xiwiralizewax68d0d.pdf
    • https://cdn-cms.f-static.net/uploads/4368481/normal_600f173932d53.pdf
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ffc1f038e7dc.pdf
    • https://cdn-cms.f-static.net/uploads/4411915/normal_6014b53e71f9e.pdf
    • http://sale50.pro/pedals_to_use_with_hx_stomp5rbu0.pdf
    • http://malapiwo.66ghz.com/aoe_4_free.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602d005db9cc7.pdf
    • http://edevletorg.com/juwivajozebije2ghdj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sabobenuwe/lopadugosi.pdf
    • https://s3.amazonaws.com/dukavunivifa/abbyy_lingvo_dictionaries.pdf
    • https://s3.amazonaws.com/getizar/97374766434.pdf
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_af9d95b18716471e9fa9a08b6195d6f3.pdf?index=true
    • https://s3.amazonaws.com/dejazuvorira/vajuvuwujofajajabam.pdf
    • http://tufeloxe.rf.gd/39183722293.pdf
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_fff7b5326da7488a8553589e2d847c34.pdf?index=true
    • https://s3.amazonaws.com/jazofi/play_store_app_old_barjan.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_da63ae77e1954425b28f6a80d3f63f8e.pdf?index=true
    • https://s3.amazonaws.com/limewub/43566683498.pdf
    • http://vewitemagim.rf.gd/48347797392.pdf
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_e3e61f13af3f4696b7c82bbc1a05326d.pdf?index=true
    • 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_off0000d8fe.bin
6f826b7e336e3507576cbddfc2c8349a42f8a49e9be0ad3d9d9c0e9b45c15296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 5136 bytes
font_01_sfnt_off0000ea91.bin
45df5de93f235044c273e2b50255840cbb7643c3f184f4c5c3c4390d4c82e263		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10980 bytes

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