Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8fac3481894d36…

MALICIOUS

PDF

71.7 KB Created: 2021-02-18 19:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac81bf3b5e6d47cfda00f76794138a3b SHA-1: 3aafc73295e4afc86350da58d8697db21d296267 SHA-256: cf8fac3481894d360319b1a3e3ff51e07f7432decea1712feafbf198aabd6022
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and link farms, a common tactic for phishing or malware distribution. The PDF's structure and the presence of external URIs suggest it's designed to redirect users to malicious websites, likely for credential harvesting or to download further payloads.

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://jottigo.ru/strik?utm_term=supervisor+customer+service+eas+job+description PDF link annotation
    • https://cdn.sqhk.co/xokebuzizo/ghjgdhc/80057726372.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/60VXy8F/ufc_253_costa_post_fight_interview.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/pelugabene1k8it.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/gdzygcJ/zigzag_oregon_real_estate.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/dJhaheY/soccer_world_cup_2014_wiki.pdfIn PDF document text
    • http://juvugewit.iblogger.org/blooming_garden_game.pdfIn PDF document text
    • http://fb-pageunderreview.com/bewifewefasopasez1h.pdfIn PDF document text
    • http://mifvideo.space/sample_nonprofit_bylaws0ca1n.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/8VibGhf/racing_fever_unlimited_money_and_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/ha1idjA/zapebofirixazefunax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disozisujenat.epizy.com/79736479114.pdfIn PDF document text
    • http://sezajuvijib.rf.gd/dusogukutumozuwazid.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/12448456580.pdfIn PDF document text
    • http://pugijomo.epizy.com/14925423112.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://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 5568 bytes
SHA-256: 8cf6696ba0b9b95bdc0d60ee276bd53495e33461ac3b0c1abf44ee2812164923
font_01_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10216 bytes
SHA-256: 76ddbd1d5c7bd9cb1aa653d89816cb10dadc0859658556cc326d2c030a57cf4b

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