Malicious PDF — malware analysis report

Static analysis result for SHA-256 731a3b5a1d9ecb3c…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 23:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a3efd4827335c3df187f01c60e5e5c86 SHA-1: b489f243062632915d28a66cd20889c2f51850b1 SHA-256: 731a3b5a1d9ecb3cd11081039c82685e152dfbdb29da68869a46495245dc3a84
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, including one pointing to 'kuzutuzo.ru' disguised as a Husqvarna chainsaw parts list, and another to 'copyrighytsupport.com' which appears to be part of a link farm on disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://kuzutuzo.ru/123?utm_term=husqvarna+55+chainsaw+parts+list PDF link annotation
    • http://copyrighytsupport.com/6843424823w3gqm.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/74084881742.pdfIn PDF document text
    • http://investmag.org/amoeba_sisters_human_body_systems_answer_keyb35v0.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/bulave_aaj_teri_galiyan_ringtone_femaleesj2g.pdfIn PDF document text
    • http://jatepemiv.22web.org/1997_bayliner_capri_2050_swim_platform.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/vixubutibebek-mevosizunowebiw-duvagora-lorobanopetesa.pdfIn PDF document text
    • http://juzisil.22web.org/tumonoxiwiketoju.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_to_use_conair_1875_styler.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/30661842566.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/PPkjaib/pro_evolution_soccer_2015_review.pdfIn PDF document text
    • http://accface.in/bugegidezedizunotakukufwp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxilikujo.rf.gd/15688035846.pdfIn PDF document text
    • http://vavijirodujozi.rf.gd/kapomo.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/stihl_bg86_carb_tuning.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/teacher_s_guide_english_10_unit_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/samsung_q7_55_manual.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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 5384 bytes
SHA-256: f26c4ba5ed1aac17c8b4cf7ba306adddd01deb4c113d67de3478ed8e066ce1af
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10764 bytes
SHA-256: ec08960fddc555cd518c57df3fb04aae2728795cc7846182ff074fac101bbd5a

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