Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21f3373eaeb3e3c…

MALICIOUS

PDF

77.6 KB Created: 2021-02-27 17:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c87a557bf48ac89af4d827455fe704b6 SHA-1: 73770ee9b656006b6bb8cfb015c17a0a53afee5c SHA-256: c21f3373eaeb3e3c76e372403ddce76b3480c85cb8f96709dea6b056501f4293
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection for malicious purposes.

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://soxebez.ru/123?utm_term=hp+elitebook+8570w+bios+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426072/normal_6026c59fbbcb8.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/4062178480.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/holt_pre_algebra_textbook.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/lexakuzugos.pdfIn PDF document text
    • http://wofaguwere.iblogger.org/tokojinog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_600febaa83cac.pdfIn PDF document text
    • http://zipogagu.iblogger.org/rulexakijosekavufavak.pdfIn PDF document text
    • http://greyfruit.space/what_is_included_in_adobe_packlpc53.pdfIn PDF document text
    • https://xuwudivalef.weebly.com/uploads/1/3/4/8/134889087/zufiroxavabofufojupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fd1bc3836884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maboruj.rf.gd/cheetah_running_video_free.pdfIn PDF document text
    • http://nanesipub.rf.gd/18817906920.pdfIn PDF document text
    • http://zowiseli.epizy.com/soul_of_a_citizen_chapter_1.pdfIn PDF document text
    • http://zegeridibedile.rf.gd/karcher_pressure_cleaner_repairs_gold_coast.pdfIn PDF document text
    • http://sebilazog.rf.gd/wabitenijovi.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/17933820555.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_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 5476 bytes
SHA-256: 403af276a99b0988c85761d95b1fc23decda4329a94a91c89709b8f8f7278142
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 11556 bytes
SHA-256: cc1f08a0c56d60d71432fc33a6aa1432d798ef7b343ccf7a6fe173b05830ef64

Open this report in the interactive analyzer, or submit your own file for analysis.