Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9945ccc76da63b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-05 00:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec6f8c341c35c316d9d6cca2c26ccd4b SHA-1: 1c10fce90b95dbaaf3949eb730801a637dad76b6 SHA-256: 0b9945ccc76da63b114d85056b9664c3dd1273433a3ebcb2e7d4262af51830ae
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs suggest the primary purpose is to redirect users to potentially malicious websites. The ClamAV detection and ML classifier output strongly support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=tissue+repair+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/rozesivotix/dwgfxy9/lego_marvel_super_heroes_2_cheats_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_6049046d02061.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/gfjaWNF/kalajoxovodesewefam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391317/normal_5ffb314765255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365627/normal_5ff37ec4674ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381291/normal_5fcd26673aa29.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/gcpJTUL/99215386612.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/Sf6bzzQ/fexufoxuwuxafovodab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_17d1a74eb3ae4218bc1b3e0695212bd7.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_b266a7fbb64e4d159f80afbfc7206b98.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_3aaffc23a38645bd9ad821f20c466a2c.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_51aee3801b09408d9d1b299620a2cea6.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_4bce7e15695e40ea808f516f8976d9db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db12386-1463-45bc-a7ad-a05cf63c0c92/62708130077.pdfIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_d429af664338416b970c72e98aa729db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c366bb-2b6e-42e1-8562-9df79c266f4d/80148899665.pdfIn 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_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 5084 bytes
SHA-256: 3ddea65c82e79c0e5e2fec9a58e346132b08e5e46da946ddd20df751c630f1d1
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 11052 bytes
SHA-256: 2d0dff1205585fb11f20fe86f1b7edf2c203d7d84a7f400653723fc8e131a6c5

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