Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cf6a484d9216dc…

MALICIOUS

PDF

69.8 KB Created: 2021-01-27 12:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ef2e884d4d0e36eb00de0760af04e35a SHA-1: bf5fcf16bfca82a6c02e89f29f5ea52cf7578aa1 SHA-256: c0cf6a484d9216dc7bea9f9fc3040fe103cf1289c5f71d08b586abdb86437178
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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=ejercicios+de+area+y+perimetro+para+cuarto+basico PDF link annotation
    • http://bostpolamos.site/zaporuf24mx.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/3oiwKVM/safari_storme_2020_model.pdfIn PDF document text
    • http://idealicaitalia.website/haunted_tunnel_in_wheeling_wv0vyfm.pdfIn PDF document text
    • http://tokigarodam.22web.org/2014_chevrolet_ss_manual_transmission.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/c2114a11a.pdfIn PDF document text
    • http://francobusiness.com/31390762733m4vth.pdfIn PDF document text
    • http://akfb.online/game_companion_nfs_heat_xbox_one14itc.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/46fd2a841ffc2.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/RtifLfh/45442870266.pdfIn PDF document text
    • http://cryogen.me/call_of_duty_warzone_zombie_royaleagg4p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407062/normal_5ffe4e60e63e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ffa9a47d0018.pdfIn PDF document text
    • http://pomevufe.22web.org/wow_bfa_alchemy_guide.pdfIn PDF document text
    • http://construt.site/cv_format_for_job_in_bangladeshyaflm.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/boserevubusekusoxuxagaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejutamukedus.epizy.com/emulator_android_di_pc_yang_ringan.pdfIn PDF document text
    • http://korobuvorudetiv.rf.gd/break_up_boss_app_android.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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 5464 bytes
SHA-256: 2cdb4b5f6189435c57834a87f00e1cfec54156776764f079a7b0e22d3896bfe2
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 11316 bytes
SHA-256: 3891ad21edca6329e546f6114827159b1356487bfc9615ce4938af39813d99fe

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