Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c95276f634106e3…

MALICIOUS

PDF

69.1 KB Created: 2020-12-23 05:23:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce5622a5e44a620374270f9302b6149c SHA-1: d0c0c8eac8d3ed0b107b96154e886d26e2203ce7 SHA-256: 0c95276f634106e30debbee1bbb03bc49c7bee16a3131359371d5eccd0c6a4fc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'traffnew.ru', suggesting a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-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://traffnew.ru/strik?utm_term=knight+of+wands+health
    • https://static.s123-cdn-static.com/uploads/4382405/normal_5fcd6c0a6826e.pdf
    • https://foposivore.weebly.com/uploads/1/3/4/4/134472686/jebedol-xuvesavuxujev-kixatitupu.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/bakofuduv.pdf
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/92b7fd33bd4653.pdf
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5f88b5844d513.pdf
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/0f58d.pdf
    • https://puvovajol.weebly.com/uploads/1/3/4/0/134040332/d236e255d8007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wexoteluwag/standard_size_greeting_card_template.pdf
    • https://s3.amazonaws.com/pivetuzadujo/my_not_so_perfect_life_summary.pdf
    • https://s3.amazonaws.com/nagev/heart_beats_kannada_movie_free.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_off0000d385.bin
ff49f867d4622b879828397576e9d0fe5cc9a56b507ecf547a97f7551d0c54c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 5136 bytes
font_01_sfnt_off0000e51f.bin
3c7f61a66d2b6703f05c18fa02ab8bade2399880d6b162ea0d92c7fd8fdb0dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 10252 bytes

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