Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31d60eb06cadca…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 16:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2790e35ae3f3c2306c2741c96887d0c3 SHA-1: 55963a204ea54cd318c3340c612a11513ac6c5a9 SHA-256: ef31d60eb06cadcaad19946fe575033f44d89f4f59b8448713da07ccbc0d3efd
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, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

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://maypoin.ru/strik?utm_term=ubc+data+science+masters+reddit PDF link annotation
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/72ee705671b4a22.pdfIn PDF document text
    • https://pewovorawegoxuv.weebly.com/uploads/1/3/4/3/134351704/4354409.pdfIn PDF document text
    • http://daravto18.ru/739452772626jy4.pdfIn PDF document text
    • http://proita.space/483325946727k0si.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369313/normal_5ff187c1622f6.pdfIn PDF document text
    • http://domavera.ru/citation_mla_format_book8g8w5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461748/normal_5fcbab42179df.pdfIn PDF document text
    • http://reduslimitalia-official.website/69012772444j2g35.pdfIn PDF document text
    • https://jedumetunu.weebly.com/uploads/1/3/5/3/135388943/rumujuvise-josirat-gaxifokow.pdfIn PDF document text
    • http://natikolom.site/1742000576020oqo.pdfIn PDF document text
    • http://evakuator-uga.ru/dinosovaxojurutozidoza2guyb.pdfIn PDF document text
    • http://titonigofitazi.iblogger.org/19791971609.pdfIn PDF document text
    • http://razvivatel.blog/lufidewizukapevutikowiwq16wq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiraxoxepopiret.rf.gd/best_birthday_wishes_for_boyfriend_video.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/crappie_fishing_report_2019.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/all_avatar_comics.pdfIn PDF document text
    • http://giwurebo.rf.gd/gasujuwofexokobogazujade.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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 5184 bytes
SHA-256: c701f477b93f49fbe05a75b23340c730b24aeaecd162e5561bc78d3c3d9ca71e
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10560 bytes
SHA-256: b1a6e319f75173c68d3fc9b46f508ab539a8d7feafbcbba55333eb994036d440

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