Malicious PDF — malware analysis report

Static analysis result for SHA-256 41356716a94d99fd…

MALICIOUS

PDF

68.9 KB Created: 2021-02-22 08:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1d4f8af398adfd83c7631d44f6f961e9 SHA-1: 08dcb936460dcb620ec6a5a5e051b400054bbfea SHA-256: 41356716a94d99fd2efce23904875ca3d64ed5b7a7b9df38fd8155c0b13a6dc8
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=logitech+x+530+subwoofer+not+working PDF link annotation
    • https://cdn.sqhk.co/votojuxosaf/Ligigie/vewaru.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/1208bb04c6a6.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/ejjIcrz/animated_glitch_wallpaper_gif.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/gegidemumifaminon.pdfIn PDF document text
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/wakamedabuloru.pdfIn PDF document text
    • https://favujoki.weebly.com/uploads/1/3/5/3/135302790/tepogixinabigov.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/jb2Qj5E/the_hunt_hide_and_seek_animals.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/nigawenamitigobe.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/jxiiggM/tube_player_apk_android.pdfIn PDF document text
    • http://natlab.ru/zombie_outbreak_game_answerss8tu7.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/watajive/b._a._y_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/64245194515.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/94741141533.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_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 5636 bytes
SHA-256: 2f790e3f5cee0d2e19b70d503bbd555444dbfdafb7b38ede68d488c971a5d520
font_01_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 10680 bytes
SHA-256: 6cbb6c65c947272f0c7e799f7dc5484005590608e3ef81eedf1537fab7c6e024

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