Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3fef3f691a7425…

MALICIOUS

PDF

79.8 KB Created: 2021-04-03 02:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 19154847f3d7fbcc5a4894d31839add1 SHA-1: d4b40514043ebdb6bfc7035be4d1902ff51f7253 SHA-256: 3c3fef3f691a7425931ba41c45bc7b207401100069e77f22021d9954c9738af8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that redirects to a disposable hosting domain, likely serving as a lure for users searching for specific content. The document body, though heavily obfuscated, contains text related to the lure, and the PDF structure itself is flagged for containing numerous external URIs, suggesting a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=adalat+old+movie+songs+free PDF link annotation
    • https://cdn.sqhk.co/disegivoji/ggvjbgg/39510925328.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/82242082361.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/hUchdjg/gitos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fefebac38e28.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/XVRgghi/tunono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410441/normal_6001ef68153f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_6061da525f091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5fc6e00dac2e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4efacc8a-6d1f-436d-956c-7a738f8942bc/butetekad.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/cushion_walk_size_guide.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_1f50d44b9fb34030a1144867f1693b3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/629f1b25-542e-42dd-95ca-add3bdd86b93/1727471699.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/present_perfect_progressive_tense_worksheets_with_answers.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_6cdca9b3b32b45119d6ec303beb6baa7.pdf?index=trueIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_7b068200662d4e6490b267607d7c619c.pdf?index=trueIn PDF document text
    • http://gudugapapilile.atwebpages.com/business_management_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe1f309-d995-496e-83f2-9ec323164573/zenutemejipus.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/accessing_icloud_drive_on_android.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_1d4a2cd9de1d4bc58522b11bb352ba5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/80185424450.pdfIn PDF document text
    • https://f3e0ee59-b309-4736-aefa-1db4f942b0be.filesusr.com/ugd/e87662_7ccb87c536de4cf2bc249aa989a1e9f7.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_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 5276 bytes
SHA-256: dc1329a6deb1b9744b2604170567f8c463337375fed4f5162cf0d2f1659545a2
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 11512 bytes
SHA-256: eb71642255163b9b7e7f8183ea14dee15f2e2bb3cf23d3e16be6293d33981c38

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