Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cc8352cb1c607a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-24 22:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c2a4d4f260bcedee2054c2f515aad80d SHA-1: 9cbdc572a6bfe404834b3f4e49e768667bcc8476 SHA-256: 43cc8352cb1c607a13c40a51ff2bb5f289821404fb5be9ac1bb32ca60aa55766
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The document body, though partially corrupted, contains text suggesting a lure, and the presence of external URIs indicates an attempt to direct the user to a remote resource.

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://jacksth.ru/strik?utm_term=what+do+you+call+someone+without+a+conscience PDF link annotation
    • http://nageramuvepom.mywebcommunity.org/gasupata.pdfIn PDF document text
    • http://sk-anker.ru/10859290005qu8bd.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/e0hjjgj/awesome_tanks_3_and_4.pdfIn PDF document text
    • http://fakts.design/accomplishment_report_format_samplelqjcx.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/iaghhjj/switch_games_coming_soon_uk.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/identity_theft_reports_2018.pdfIn PDF document text
    • http://reduslim-italy.site/68968709036i8vmr.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/wogikokuzotaxa/pesedot.pdfIn PDF document text
    • http://gozozofufeb.rf.gd/58224863650.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/tuviwutegevudirigum.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/14746742622.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 5288 bytes
SHA-256: c4f3d40f77c74b0e799b342cef261a858cab2ab586f041fb5eb129fd7b743d68
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10788 bytes
SHA-256: eaeae6383870ccf22209b2ef6b12512393d3fe36c4289c1cdc8e207633fa6299

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