Malicious PDF — malware analysis report

Static analysis result for SHA-256 607c3085ea4d8337…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 22:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de0c990d50de634ec41ffccbf8608b7 SHA-1: d90def1f3b51fc7e3b99c6a1d7fab2261d5d66c7 SHA-256: 607c3085ea4d8337beacbc728557d63fc25bfcbe9f6f8b016122bf8a7b5f16e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, with one notable URL pointing to `vilenefex.ru`, suggesting a link farm or phishing attempt. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://vilenefex.ru/strik?utm_term=cuisinart+juice+extractor+cje-500a
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/mamebaf.pdf
    • https://kazarebowuw.weebly.com/uploads/1/3/5/9/135972211/zapubagewex.pdf
    • https://wudufedowuton.weebly.com/uploads/1/3/2/8/132815791/fujox.pdf
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/5991920.pdf
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/zovigufotebar.pdf
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/8441799.pdf
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/liwofuzuligaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babuxufarizuxur/merge_logiciel.pdf
    • https://s3.amazonaws.com/xugigabitulu/87482828652.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_a18e36567f304767af40520d368cac7f.pdf?index=true
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_925406b2ed264b54ae6c8cd128e172a5.pdf?index=true
    • https://s3.amazonaws.com/pilazi/why_does_my_key_fob_keep_beeping.pdf
    • https://s3.amazonaws.com/fojaxexino/nedejij.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_7301b48485404b47804a1bdfc827e052.pdf?index=true
    • https://s3.amazonaws.com/kovilowab/47899947540.pdf
    • https://s3.amazonaws.com/tezude/87795810917.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_c1c81053d8bd4b8aad396440e4f1bed4.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/mobujogixajituzirixufu.pdf
    • https://s3.amazonaws.com/dovulavavo/68920076731.pdf
    • https://s3.amazonaws.com/risisipajole/bobby_movie_songs_free.pdf
    • https://s3.amazonaws.com/kifutizijebuj/45591964013.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_0f3fcb98edb54cbf8e0faa01030fb7ba.pdf?index=true
    • 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_off0000e6a2.bin
caa555cc0263b90a7b4f0bf6f38453f098a4549f576fdb7eddbaa98334b00283		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 5108 bytes
font_01_sfnt_off0000f81c.bin
9a2940c4c93472adf4a95049c4589af2c5719da0b166de13fc6f8fe32cda3dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 11088 bytes

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