Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf7192bd34268b8…

MALICIOUS

PDF

70.6 KB Created: 2021-01-28 08:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f124763befb943d2bae2881e99cbebe4 SHA-1: e6acbfb18d344d30507c14e5c277e6f06c57a493 SHA-256: 6bf7192bd34268b8acfe56d90850825b73604da049bedbdc34546d18a765c8d5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous external URIs, including one pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URI usage are consistent with common phishing lures.

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/123?utm_term=selection+and+speciation+packet+answer+key PDF link annotation
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/kewobafenimaf_dufuri.pdfIn PDF document text
    • https://giweberemep.weebly.com/uploads/1/3/2/6/132682555/6796652.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/jilepole.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/ggVfjgG/bonoxosefowapasuvu.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/7994320.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/idV4ihu/jiravufekovodefuxitizad.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/japubivewoxokoge.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/ccLBifQ/fupopizewolaparegile.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/jelaruxiru.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/7672737.pdfIn PDF document text
    • https://cdn.sqhk.co/wejewenu/jdgcmqe/best_photo_editing_app_for_computer_free.pdfIn PDF document text
    • http://didezidise.22web.org/cw_activator_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofadezowudekeg.epizy.com/chamakam_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/grammar_exercises_for_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/.pdfIn PDF document text
    • http://zotawof.rf.gd/numberformat_java_6.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/infective_endocarditis_guidelines_american_heart_association.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/xulidodidudowutasaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/36471660594.pdfIn PDF document text
    • http://gejebegujisutil.rf.gd/13038197109.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_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 5428 bytes
SHA-256: 65a68b6d36a5fa15148aac571dc5712145bd49e71a76ae9542149c22326a68bd
font_01_sfnt_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 10420 bytes
SHA-256: 0284733fae54973400e3b21694d9b4c97278b820ca438e181486d17c88bc400c

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