Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6ce8b22ff9d0f…

MALICIOUS

PDF

74.1 KB Created: 2021-04-17 04:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9df0af6af9035ab8e4800fcd86edf652 SHA-1: 9c2822e6fed2070991810777c329a37d51bc4862 SHA-256: cdb6ce8b22ff9d0f7c9e79cec2bfe7cab0f5bef72e03fc86c7a0bebe317f8265
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=how+to+clean+dymo+label+printer PDF link annotation
    • http://nokasosozigof.mypressonline.com/my_cloud_home_setup_static_ip.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/what_are_the_basics_of_calculus.pdfIn PDF document text
    • https://nitonigizumori.weebly.com/uploads/1/3/0/7/130739712/3331179.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/Qighj07/allen_theaters_clovis_nm.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/stokes_theorem_solved_examples.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/canon_eos_5d_mark_iv_specs.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/6602502.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/koravozon.pdfIn PDF document text
    • https://finejorokisitoj.weebly.com/uploads/1/3/4/4/134495390/9532883.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/539ed9dc6329.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/essentials_of_computer_organization_and_architecture_fifth_edition_linda_null_phd.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/njejbwE/matirewisuxif.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/Cgidzjd/orange_ball_tennis_drills.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/cakewalk_9_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_fcb7e94c20f647029ed9d2315ca0e507.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_719c1e5d124a4ecbb80a0b9ad09b8be8.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/fyi_for_your_improvement_6th_edition_free_download.pdfIn PDF document text
    • http://torejejowomu.myartsonline.com/assertion_and_reason_for_aiims.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5336 bytes
SHA-256: 948d5854c813f7b133ca0cce72cbf3d8cfed94447a35dcd7592096f1dbfa0d20
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10708 bytes
SHA-256: af56cc42b6bf4b7ea1c01ffd9393f3ef954d5f6e5804777297651b33fcdc93c6

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