Malicious PDF — malware analysis report

Static analysis result for SHA-256 286d670ef0ae0ac7…

MALICIOUS

PDF

74.1 KB Created: 2021-06-01 16:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea9d79f322a631a9ba2c116669b7f6f SHA-1: e723a61ab4ab7faf828a6476a21a07371118d001 SHA-256: 286d670ef0ae0ac7af8b7bdb3955025c95054f3e86c10f38f8c456353c8c939c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=can+you+watch+live+tv+on+roku+express
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/takifatud.pdf
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5fe1cb943d50f.pdf
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/3f39c52d7d47.pdf
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fe2d3c4c8e36.pdf
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/bupip.pdf
    • https://static.s123-cdn-static-d.com/uploads/4421199/normal_60b0ca6ac68ba.pdf
    • https://cdn-cms.f-static.net/uploads/4501054/normal_6018cacfe1113.pdf
    • https://cdn-cms.f-static.net/uploads/4489028/normal_6017a8b5d41ce.pdf
    • https://bubodenolaper.weebly.com/uploads/1/3/4/3/134378344/5388709.pdf
    • https://static.s123-cdn-static.com/uploads/4470540/normal_6007126c2f991.pdf
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/5393378.pdf
    • https://static.s123-cdn-static.com/uploads/4393028/normal_5fc60444e04d1.pdf
    • https://cdn-cms.f-static.net/uploads/4462362/normal_606e67713032b.pdf
    • https://sexaxekeka.weebly.com/uploads/1/3/5/3/135313825/tekexanuwewenisupelo.pdf
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5ff3111aac1c6.pdf
    • https://cdn-cms.f-static.net/uploads/4468253/normal_6062b3cd39e33.pdf
    • https://static.s123-cdn-static.com/uploads/4488580/normal_5ffb24fb82229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e556.bin
3aa9c0927c764d36b635bd049fc6e016395a6940a188ef3c8d863c97c4558045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 5312 bytes
font_01_sfnt_off0000f77a.bin
77ebdb82d36e26592007ed3a530b602b55a58d260c63be6254f73144514f908d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10460 bytes

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