Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f4df1e3b7b3463…

MALICIOUS

PDF

67.2 KB Created: 2021-01-08 17:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cf4d741758d1eeb08059f8819e915955 SHA-1: 02c4b6c8dd7678eb12af9dab7fd659ac081402fa SHA-256: 50f4df1e3b7b3463f3bfa8c3c17eb9d68cbc642ff628816fe2fee99186a1a330
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were directly extracted, the nature of the link farm implies the document is designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafftec.ru/aws?utm_term=rel+stylesheet+in+css PDF link annotation
    • https://cdn.sqhk.co/bajipugotox/uhiikJj/scentsy_warmer_of_the_month.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/4307047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375514/normal_5fdfc4fad60b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457857/normal_5ff077995915e.pdfIn PDF document text
    • https://cdn.sqhk.co/fitigeru/giCjfie/download_jet_car_stunts_lite_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f92d88ba3ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5fed6913eb48e.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/Hijhdhb/vosaxawupodafo.pdfIn PDF document text
    • https://sewimumox.weebly.com/uploads/1/3/4/6/134668968/3686393.pdfIn PDF document text
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/5138858.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/6f1a9f5f-93b0-46c0-8db7-87b5fbaee58c/super_mario_odyssey_mushroom_kingdom_moons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d012c943-bbbe-4dd2-a85c-747dbc91b999/gijasifopuxixano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9137cdb6-11cd-4f57-95a2-5b3efd9f77c3/car_lumbar_support_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b0a21c-7dcf-4519-bdd2-c48ec4ba1d76/formation_geste_et_posture_gratuite.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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 4688 bytes
SHA-256: f8a0f94b0d76515c3fbad8e1a4331bbf581f13f07fc1141ce55127d463ccb7c8
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 11000 bytes
SHA-256: 97176abf82522ecca1a6730ea744e6127c2aeddddeae213ae2f823bd2ffc3d23

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