Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a34c73dd23bef6…

MALICIOUS

PDF

67.8 KB Created: 2020-12-26 12:54:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 562f766aa9a1d397e2041e23d6e6a0de SHA-1: d6a2e2fd48695f0ad115321bb49e1806dedfca0a SHA-256: 57a34c73dd23bef6c0b820939e416a8282ec495e759cff80a7cdbce5054d11fc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a critical ClamAV detection and an ML classifier, indicating malicious content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a URL with a 'strik' path further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=boat+race+slang+sports
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8c5c77dc82a.pdf
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/putalazaradazuwozus.pdf
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/sopexaxexug.pdf
    • https://cdn.sqhk.co/lunajevon/Tyr8g8Z/greatest_anti-_heroes_in_movies.pdf
    • https://cdn.sqhk.co/lisesemafo/jjejfig/22399835444.pdf
    • https://mikutefax.weebly.com/uploads/1/3/4/8/134866710/sufisavomevepob.pdf
    • https://vedokaxo.weebly.com/uploads/1/3/4/5/134529556/pokabomufuzamun.pdf
    • https://fejajeger.weebly.com/uploads/1/3/4/6/134614243/8064c6f.pdf
    • https://cdn.sqhk.co/lilanoto/ib0d9KO/valusogivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1ee5d795-91c1-4aaa-903c-7177bbdc249e/romijamivafidewusogulapav.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/free_music_sheets_for_guitar.pdf
    • https://uploads.strikinglycdn.com/files/91161ee9-559f-48b0-82f5-16613b475ea3/62602278562.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c210.bin
7b4f605966c92b53c58ae51104e9a90e3b6b68a0ad9d8d2a235c68d5807b00b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC210 4892 bytes
font_01_sfnt_off0000d2b5.bin
a625fe8739a70aa1aee2901b63bb60860e79b4264a4f4e5cf13f115d3f71acea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 9436 bytes
font_02_sfnt_off0000f32e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 4324 bytes

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