Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c36ff171ee86af5…

MALICIOUS

PDF

68.4 KB Created: 2020-12-07 20:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0b486e30e6222176f5bd0323a6b0899a SHA-1: 1df1c53b4794d291850f575655620da9d5c2b379 SHA-256: 4c36ff171ee86af56a79308b44c58b594296af029e13be1a647e5cc7d9cb1a12
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The presence of a download button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=wen+4212+refurbished PDF link annotation
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/fodesin_jexobotozoral_kuxikuwasogigu.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/takij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8a3fdec0666.pdfIn PDF document text
    • https://bupuxikamofimap.weebly.com/uploads/1/3/4/7/134734142/fonepegogenabigemeba.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/5196157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fa2d6f86cd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fbe349539f5a.pdfIn PDF document text
    • https://xepuzuzolewu.weebly.com/uploads/1/3/4/3/134324818/tiwinozosunigom.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/c2a46bb0.pdfIn PDF document text
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/0b6bc5.pdfIn PDF document text
    • https://ravekenelar.weebly.com/uploads/1/3/4/0/134041687/3457174.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/xozuwaxegajij_gobezezib_wasibotuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ffab8139af037645cac7/t/5fc232cacb3e0f5771996491/1606562508243/tetemekajaduz.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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 5176 bytes
SHA-256: aa6c519e72b489276a891209102a93b75c86fdebf9a041e58d778f55a86545b6
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10512 bytes
SHA-256: b05310ae96931cfa07ea2fc5c845505b19528e0756d2293d262e3ef24cd5428b

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