Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04f6e27576969ad…

MALICIOUS

PDF

78.6 KB Created: 2020-12-23 03:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c8a4eb10f25b93607730766d90ce030 SHA-1: 12816afaee883955ef1874626294fb1b8c080757 SHA-256: b04f6e27576969ad6835b9cb27a3e2ca03ccb9bd8bbdcbc19d35d8fa32cafe2b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with 22 external links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The primary purpose appears to be directing users to malicious infrastructure, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=absolute+rc+heli+simulator+pro+apk
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/fa00f112a57.pdf
    • https://cdn-cms.f-static.net/uploads/4418000/normal_5fb3d2d807463.pdf
    • https://ledekatibawe.weebly.com/uploads/1/3/4/2/134265754/292e9521611170.pdf
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/fda91068d6c.pdf
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/fumodonogo.pdf
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/1d9bba7.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/vulipatal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wopari/alone_movie_video_song_mp4.pdf
    • https://static1.squarespace.com/static/5fdd37885b7bc966055e0d98/t/5fddd91e892c8943b09de10d/1608374560450/circulatory_system_quiz_answer_key.pdf
    • https://s3.amazonaws.com/xeruxaxer/60626056556.pdf
    • https://s3.amazonaws.com/degisapemifa/19782148504.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_off0000f837.bin
e83f1a5e747140aec3df74aaa2895826121e438ec729915a22b2242ce22cecb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 5368 bytes
font_01_sfnt_off00010a40.bin
8229a5efa0f7d176479444dbb363d5ec7b844de83624646c975b7a423f493dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 10348 bytes

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