Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58a1ff0d280f355…

MALICIOUS

PDF

72.4 KB Created: 2020-11-27 11:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 893389056bf9405424e4201a079f9d7d SHA-1: 107b183027b7144f2c716617a5389924a94054b8 SHA-256: c58a1ff0d280f355d9910d81b8191ce4d2558b2e07fdcb8e583521175baa9685
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, including one with a 'utm_term' parameter suggesting a phishing or SEO manipulation tactic. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/aws?utm_term=soul+brothers+album++zip
    • https://bififofivajarat.weebly.com/uploads/1/3/4/3/134315789/5213335.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5f976f3b787e9.pdf
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/9981045.pdf
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/2682796.pdf
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/tokemajutatebigeto.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/8494558.pdf
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5f8fbb88df1de.pdf
    • https://wowupaxelisone.weebly.com/uploads/1/3/4/8/134856013/f4c6dccd1532.pdf
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/taxiren-kikalujodozezaz-kadeje-vegexov.pdf
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/pujokukesogitu.pdf
    • https://xalusadi.weebly.com/uploads/1/3/4/5/134595224/8294856.pdf
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/541154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e3edebb-c37d-41ee-b46f-a1f579c92f13/exo_xoxo_songs.pdf
    • https://uploads.strikinglycdn.com/files/9e980e07-a069-492a-9aa8-878773188076/hesi_exam_math_study_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d611.bin
66fef094f92f930ad5a75b50331ec4f72b731c66494b215afaead68e83ca385e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD611 5352 bytes
font_01_sfnt_off0000e816.bin
ae950596559470edbda39bd7a1ce43b9972769d02d03ce3c65befcc8cac80696		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 13104 bytes

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