Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2a959240a025c5…

MALICIOUS

PDF

73.3 KB Created: 2021-02-04 14:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bef8b81f91d6fcf92a0478048d6d2b33 SHA-1: 885a42793816126a5066caff9299fcdba59f2992 SHA-256: 3b2a959240a025c56f3dfafd776899bb8de951e6131c03482df7b808bbfab69b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or exploit kits.

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/aws?utm_term=graphics+performance+chart PDF link annotation
    • http://nowofuguvinidaw.iblogger.org/dallas_cowboys_cheerleaders_uniform_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/17ZhePL/4002371045.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/GBDjdQ6/super_bikes_2_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/jpiezgg/kiwiwarosiwelimoroj.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/NhgFhiZ/craftsman_tool_box_black_friday_2020.pdfIn PDF document text
    • http://siteznakomstv69.space/larifefimezug0dvsu.pdfIn PDF document text
    • http://bilkaita.space/granite_mountain_firefighters_autopsb2jxj.pdfIn PDF document text
    • http://zupaxowo.22web.org/3d_photo_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/gC1gjzf/jikemorupilebufeweved.pdfIn PDF document text
    • http://goloturasituj.66ghz.com/94841753366.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/wunupalezozerud/play_candy_crush_online_free_no.pdfIn PDF document text
    • http://sujonereduvuk.rf.gd/76113169614.pdfIn PDF document text
    • http://zerodawoti.rf.gd/bulk_density_of_materials.pdfIn PDF document text
    • http://fodarevo.rf.gd/17395047264.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/borazowilumizeputi.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/jifanabororumuzedomufa.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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5256 bytes
SHA-256: a442903a015b6edc7e13df3bd0362799062b39ea1c9bb995cc992874045ee533
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10808 bytes
SHA-256: 8919d74493c42ac9e9615cfe435d640e6b71d058bf761b791d4a4f2203cb86c6

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