Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c460535bdadbe57…

MALICIOUS

PDF

80.9 KB Created: 2021-04-06 22:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f79aa3227da16cf8e3565aeba26274e4 SHA-1: 740297262e0a9d6cba3c02098b9992ad9991fa46 SHA-256: 9c460535bdadbe571b49b955694ad0870290b0c00d6228a04accd37358e54228
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URL and the nature of the link farm point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=romeo+and+juliet+1996+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448124/normal_6024f567363ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_602da0ff6b13c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366956/normal_5fe1a8379595b.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_602d9c3272116.pdfIn PDF document text
    • http://defi-bet.world/jensen_jta-230_3_speed_stereo_turntable_with_built_in_speakersj38d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_5fd35852ecfd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ffc7272b4de3.pdfIn PDF document text
    • http://ig-copyrightnotice.com/cascading_style_sheets_tutorialigdcx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5fddfc9342f70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fe6bbf2b2c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_60579927a1bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_602248e53df62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_00e462c6365d47308db24eb21f05c7e9.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_c7a1a6a425754e778d562d35c7d400a8.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_00c5be37d61c4caf9f61c2658e882d9c.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_2955d4556efc466ea4f96ee5980f05f7.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_521424bd684d45a99414ce69e6f578b0.pdf?index=trueIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_60d879753bec41dc80d9ccf601f94699.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_f09087cedca142c3a804dbd1061ddffe.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_5892734e63b547f19be5451adba264ba.pdf?index=trueIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_ec3c398d85ee49e4a908620b348c0c1a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5120 bytes
SHA-256: 386ad2e2636ae2d74c5a4fff61a246f9f84480f5cd9bf618ff1001aaa404ae33
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 11264 bytes
SHA-256: c29a99c86a40eaffe4736a081207d1923c24f24e8298d1ddde2397527a77ddd8
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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