Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bd0019689f15a0…

MALICIOUS

PDF

76.0 KB Created: 2020-12-31 17:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7db32bf9dceaa543cb67f5aa608afade SHA-1: 90d59fbcb2fb944981a49a9a17e8ac8b3fc59499 SHA-256: c0bd0019689f15a0871ad2924aa42495c854c8c46a3a71802a73bd16d2ede5e5
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains a link farm and a callback phishing lure, indicating an attempt to deceive the user into contacting a malicious entity. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=recargas+a+cuba+rebtel PDF link annotation
    • https://cdn.sqhk.co/gisusisabez/XbLQtjj/my_talking_tiger_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/h3hjAhe/punuben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f8708e4b069c.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/hjfQQgi/ninja_blender_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/djc4bzH/94253532400.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/c526023c39f.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/032fa674-4a0a-4d10-bd64-1d8b8a2839eb/ejercicios_resueltos_productividad_ecosistemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5043d6-fbb3-42e1-8682-01a91c814748/Bollywood_intrumentlne_sahovanie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b847cb-a2ff-4f26-8f29-504bb0883510/61823420842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7d0fa8-97e0-4cf5-ac16-daa0e13e2bdd/the_volume_requires_contiguous_disk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e920170c-44a5-4199-85fa-1fed474d349e/bugiba.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/26904002613.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/my_boy_games_pokemon_platinum.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5112 bytes
SHA-256: 6ceb0278b7c31a5a18fe94e966a0f075683898f7ec554f9da8163cb9c619c769
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 11124 bytes
SHA-256: afc968b3971376bb410eaa63489815178b23ff6fdbc5ae6e2db273b0bb3e2df9

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