Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c0be6d8cc7909a…

MALICIOUS

PDF

76.0 KB Created: 2021-05-10 23:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dc6f171da8280e955336a426055e7398 SHA-1: 90942642cd0faf8910dd1f0d7c4921bab47cfd8a SHA-256: 29c0be6d8cc7909aa86ff8591806ca30644f0306d125b8acaebb4d1d494c3a2b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://bologen.ru/strik?utm_term=ancient+magus+bride+chise+arm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377125/normal_605a8eea0b10d.pdfIn PDF document text
    • https://zulovinivu.weebly.com/uploads/1/3/4/7/134758195/zolefun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_6042f26db1315.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/6121174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_601a2f910abef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5fcdd0d97ec8c.pdfIn PDF document text
    • https://kujutokisomodu.weebly.com/uploads/1/3/4/6/134662527/4945d.pdfIn PDF document text
    • https://nafezukame.weebly.com/uploads/1/3/2/3/132302716/tikokesojibawepoka.pdfIn PDF document text
    • https://semulojera.weebly.com/uploads/1/3/2/6/132695334/guwafalifasuban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6052ce0ec3011.pdfIn PDF document text
    • https://bitusuverutito.weebly.com/uploads/1/3/1/8/131871453/198606.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/tudux.pdfIn PDF document text
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/zufitijaf.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/6b2e7c0b-10d2-4e0a-969b-46681868a08f/mechanical_vibrations_6th_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7aa49e-03da-45e2-ba5d-818efee8ace4/what_are_the_four_gospels_in_chronological_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8825c3-5399-4779-b79d-ddc6f24bdbd9/68838801848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1a44ce-c4ab-4b0d-8f12-fabd5911ab0f/what_is_the_most_current_apple_operating_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808ac896-4242-487a-a941-d589d811d688/kulefitagezivunakogetid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b546a030-ab3d-4b35-9b27-455f016b3f6f/wezixaxusifexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8faaecd-c639-40e6-a0fa-ed2ceef891c9/neredotiv.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_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 5448 bytes
SHA-256: 1f399a1d02530863ffa6c1a7c74be6832296ac1d0a1937cd1278fe1e710d7b32
font_01_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 10088 bytes
SHA-256: f9e7b7cd2dab972a9660843fc87ee15f06324ca2384ba7b0c3252d54eeb8d84b

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