Malicious PDF — malware analysis report

Static analysis result for SHA-256 3295238586b95060…

MALICIOUS

PDF

74.5 KB Created: 2021-01-11 11:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f6cabccbc54fa6b4d958ac1f57536f SHA-1: 74c78da3242855ff53f9e983a733be35d11107f8 SHA-256: 3295238586b95060d345d7d0240b08b83a85702f31c2bffe4914785b5d13b4ab
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The heuristics reveal it functions as a link farm, embedding numerous external links to other PDFs hosted on disposable domains, such as 'xefanopebowemid.weebly.com'. This pattern suggests an attempt to manipulate search engine results or distribute further malware. The presence of external URIs and the link farm behavior strongly indicate a malicious intent to redirect users to potentially harmful content.

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://trafftec.ru/aws?utm_term=serologia+sifilis+pdf
    • https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/6978344.pdf
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/ruvaj.pdf
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/b4229788.pdf
    • https://cdn.sqhk.co/vunelebu/RNRhbgi/modern_warfare_patch_notes_september_15.pdf
    • https://nemulokisen.weebly.com/uploads/1/3/4/4/134492012/5825a177.pdf
    • https://cdn.sqhk.co/genamudazunu/0iprI8w/pusher_mania_app_download.pdf
    • https://birunudi.weebly.com/uploads/1/3/4/4/134448669/sixavo.pdf
    • https://static.s123-cdn-static.com/uploads/4416791/normal_5ff65c971c7df.pdf
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f919a23bb639.pdf
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5fb36a2021fce.pdf
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fe5f361c0f96.pdf
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/2130920.pdf
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5ff2054ee672a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bitajemisajoz/wexubilu.pdf
    • https://s3.amazonaws.com/pewebopufupe/manual_blood_pressure_cuff_parts.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_off0000e785.bin
3e11056985bf6e9f9cc5dc37f46be77e5472b3b099c43445f8a216759c15bf10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 5312 bytes
font_01_sfnt_off0000f9a1.bin
46499ab18f210fd5e6102d624ce4853f4a77f835cf6aa2ab5c1eef69c8c84ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 10516 bytes

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