Malicious PDF — malware analysis report

Static analysis result for SHA-256 23995b2e249b8ae2…

MALICIOUS

PDF

77.0 KB Created: 2020-12-23 19:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d3533ed650e378edb23bdf73f294b628 SHA-1: ecf4f5b708f963788a8649efa6039ce40906e0af SHA-256: 23995b2e249b8ae20d15fc164530d9b51f193f697b096f787ddf55f716580fb9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were extracted, the embedded URLs and heuristic firings point to a malicious document designed to redirect users to potentially harmful sites.

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://traffset.ru/aws?utm_term=canon+5d+classic+manual+mode PDF link annotation
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/7862454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_5fd233663a0fd.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/RIY4fYR/tinopifabenexazekakijatu.pdfIn PDF document text
    • https://pazumiwasosum.weebly.com/uploads/1/3/4/8/134892739/rakurikavuneroti.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/c5d94.pdfIn PDF document text
    • https://zejeranuko.weebly.com/uploads/1/3/4/6/134649068/1223447.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/ighdLTg/goalaso_football_penalty_shootouts.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/tefotamufuwebonabive.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/2428a197-47e8-4b49-aef0-07ba7e57cc4c/63118993196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c48f179-1e38-496b-9b0f-35ae2d24cb61/maytag_bravos_ecoconserve_washer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2ea28f-3273-4c13-a3d5-ac7c91fb9f77/ragnarok_eternal_love_leveling_guide_blacksmith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb52623c-96b2-447b-982b-2442c0992015/gatowoxexopawaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f288c3-0d6c-46cc-b1c7-c8f22d70e0f5/sexinawifajupediwoduso.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 5020 bytes
SHA-256: 8de6a041f9a19e66c0b8d7e15752873a290caafc6e552f4b8a9dc9c248df0189
font_01_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 11080 bytes
SHA-256: 77273e457fd2dac63545196e78a859226b2a7c3e5390432b7d3a05a32469484a
font_02_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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