Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed480f7ecb85efd…

MALICIOUS

PDF

70.4 KB Created: 2020-12-20 21:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b600c7e8ba67fa7e42ba8f361c3fe193 SHA-1: 19b7f2b1eef6fabcdbd4b6b6bc402dbd20b60ee7 SHA-256: 9ed480f7ecb85efd72e9912d9ba1dcb7b3c5cf3fe671aba65984c2500c29dc6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one pointing to 'trafffi.ru', suggests it is designed to redirect users to potentially harmful content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/strik?utm_term=blue+pelican+java+lesson+answers
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fc37aa4c7f08.pdf
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/3709424.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fb2fa38adcf0.pdf
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5f9889fa3f861.pdf
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/09480c.pdf
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fcbe6623df9a.pdf
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5fa615ae96fb8.pdf
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/sewexav-woduso-tuvowunesini.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/dozoratalimuzilujase.pdf
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5fbcb48e8676c.pdf
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/dikarotetufe.pdf
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/f88a69249e537.pdf
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5f97ca583ec7a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc115bd5e8e827d428ee316/t/5fc4f1ef1972c46e3c385f64/1606742511807/72811838230.pdf
    • https://s3.amazonaws.com/tugumeb/classifying_triangles_worksheet_grade_6.pdf
    • https://s3.amazonaws.com/fomudebipefasu/73519106089.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_off0000d23e.bin
4178bad19001f1bbae2fb33162c234aae3d888b801f58a5dcb3656ef41c2f5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 5204 bytes
font_01_sfnt_off0000e41a.bin
a6dcde9dc993099579e60a5530dedff44a3cac5433d9a721465dd061f3535d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 11988 bytes

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