Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce655ba55c41b735…

MALICIOUS

PDF

63.8 KB Created: 2021-01-15 05:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 160045ed6e9282899fbff9327a4f09ca SHA-1: e97af8c0f36fa2f2f9332afc614e519f4333f730 SHA-256: ce655ba55c41b735d97e1598cdc5fbc94a860fd8ff74b6e2970dc58412a34747
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, including one pointing to 'traffset.ru', suggesting it functions as a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links. No scripts were extracted, but the presence of multiple external URIs is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffset.ru/aws?utm_term=bhoot+sound++pagalworld PDF link annotation
    • https://site-1203055.mozfiles.com/files/1203055/jeguvofagex.pdfIn PDF document text
    • https://site-1175739.mozfiles.com/files/1175739/lelebujedo.pdfIn PDF document text
    • https://site-1178487.mozfiles.com/files/1178487/kingdom_wars_tower_defense_mod.pdfIn PDF document text
    • https://site-1174122.mozfiles.com/files/1174122/the_weather_channel_live_jim_cantore.pdfIn PDF document text
    • https://tivagojeno.weebly.com/uploads/1/3/4/7/134714391/8453834dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fc59171bd539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f9351ce8669a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fb5ff144e980.pdfIn PDF document text
    • https://site-1177793.mozfiles.com/files/1177793/nojejigaruvusobaxovefuko.pdfIn PDF document text
    • https://site-1178590.mozfiles.com/files/1178590/16984489949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f8ea2d8543cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5fbf085d7fa89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 5360 bytes
SHA-256: 209b56a527bbf2f2d38c0a3cacbf9d65f4aaa6665ec4dfa111973e74f6cda1f4
font_01_sfnt_off0000cfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 10284 bytes
SHA-256: 053e9d2bb405dcca6f2e8434d87182a79e07f96d33a465b0b28ed3f1e7fa195d

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