Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8a8898906aaa7c…

MALICIOUS

PDF

68.8 KB Created: 2021-02-07 01:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: baa2c196a9835a915e9fff91c3844133 SHA-1: d78129ff580a4a039cf9632a995937e9af996c4b SHA-256: cf8a8898906aaa7c6bca231eea008cb2e2bdf0224723efc72c17f565d6901692
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://leonvi.ru/wb?keyword=witty%20answers%20to%20where%20are%20you%20going PDF link annotation
    • https://cdn.sqhk.co/tevunufoba/OMeifmz/93544671391.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/ij6ghal/gfx_tool_for_frag_pro_shooter.pdfIn PDF document text
    • http://mklhhhh.space/limiting_factors_affecting_photosynthesis_worksheet_answersgzzf9.pdfIn PDF document text
    • http://dvestideyli.xyz/35080679695fzgcu.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/hcjbDhe/76896655441.pdfIn PDF document text
    • http://cocobeautybar.ca/vitalina_wilson_fresno_ca0bzfx.pdfIn PDF document text
    • https://muvepabeburok.weebly.com/uploads/1/3/1/4/131453329/lunibo-nasuru.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/cf6ed751b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5fe75becbefb3.pdfIn PDF document text
    • https://tizelilof.weebly.com/uploads/1/3/5/3/135311218/a639646123e06e.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/bobibelitufepid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501775/normal_5ffad2d39f2aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_6014eb52ed637.pdfIn PDF document text
    • http://egosikenclub.com/sarna_demodecica_tratamiento_naturalrb8sd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosagoba/ketez.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/bored_button_emoji_quiz_all_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/17448438797.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/vidasebobusadafat.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 5120 bytes
SHA-256: a80b0cabc13915cc0e58bc92c97393463fe7b3be49e4f97b51129ab34535995a
font_01_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 10056 bytes
SHA-256: efd57451c0110e047d806df9be7d951529c693334c42858d6396d2431cd239a7

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