Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abb2bf2c245d09b…

MALICIOUS

PDF

69.2 KB Created: 2021-01-21 18:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e4019950ed59b042417e1e3aaf743fb4 SHA-1: 233fc9f5e8b37ee0a059a81485740aa0209dbec8 SHA-256: 5abb2bf2c245d09be1c25fd5662b1d7331b37af2710890f066c5fe030a87bc1a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing or malware delivery technique.

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://traffnew.ru/aws?utm_term=decimal+division+using+models+worksheets PDF link annotation
    • http://juzibekemuvur.iblogger.org/1277119393.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/58894347368.pdfIn PDF document text
    • https://site-1207104.mozfiles.com/files/1207104/best_cheap_android_phone_cases.pdfIn PDF document text
    • http://gujufifirisin.22web.org/slope_parallel_and_perpendicular_lines_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/gc2NiaO/dewuvulipemelezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomimek.epizy.com/dududepatibojasubat.pdfIn PDF document text
    • http://kepirodineloga.epizy.com/instant_family_movie_parents_guide.pdfIn PDF document text
    • http://rugokabiko.epizy.com/sexow.pdfIn PDF document text
    • http://xalesikejuxo.epizy.com/xukefikakupokizasiz.pdfIn PDF document text
    • http://lajuloverebob.epizy.com/erythema_multiforme_bullous.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/68590663415.pdfIn PDF document text
    • http://gipumupanaw.rf.gd/shintoismo_riassunto.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/nice_guidelines_for_endometrial_hyperplasia.pdfIn PDF document text
    • http://tobavukopipe.epizy.com/chair_conformation_cyclohexane_axial_equatorial.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_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 5568 bytes
SHA-256: 85b5b87a5653a796f6ce261c5b6f4ed12b30ac831acaab666ae3d2e20d48edf5
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 11560 bytes
SHA-256: 6018b4b2a38fcb30d45d7a740bf3f0d9883d20123245347b22874c8c9ae1c339

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