Malicious PDF — malware analysis report

Static analysis result for SHA-256 b033aa326eb4063f…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 07:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf5220a51cba62e427d4ca1411c827df SHA-1: 2ab2191a70a8ff01e0dc300e44395d722db0427a SHA-256: b033aa326eb4063f2605d9ea48c1e24059d9836818c72c3f7db3eda2138edae2
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 pointing to a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

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://kuzutuzo.ru/aws?utm_term=how+to+make+cream+soda+with+sodastream PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477916/normal_60069ac0a18fc.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/13974714176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_601dbbf027ef7.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/kevuviketedexelus.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/hb8UFsd/zavibasugarovijubub.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/52809083134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481154/normal_6006ba20b3058.pdfIn PDF document text
    • http://grinallex.shop/ionic_3_angular_4_tutorial3468o.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/voxijixafurosiloninit.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/Hibrz8p/active_police_chase_near_me.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/zisaranawejovekada.pdfIn PDF document text
    • http://gamedv.design/bdo_imperial_delivery_reseto4fu2.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/RNZvvO7/bewusina.pdfIn PDF document text
    • http://kemytbok.xyz/wixibonuwelixiob9u1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6012d07dccad2.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/yeZJgcG/throne_offline_mod_apk.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/are_electrolux_vacuums_worth_the_money.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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 5264 bytes
SHA-256: 5924fd259104d25596af8556c1501c5e0908b28ab52c763a3b24f8ccc87d8c8f
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 10748 bytes
SHA-256: d12cd542db1e11e72d8ee2926ebc1f9a6547ee3f9fb2f94302fed280fa44e09a

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