Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b42e08ee51d2190…

MALICIOUS

PDF

73.1 KB Created: 2021-02-24 05:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b2c3a3b8ab75e633d6d110babb091c4 SHA-1: f3b70bc8aa0cbad07a355c80417a95ef440b0078 SHA-256: 3b42e08ee51d2190e28ce6b74dbee5e2aa65499742df15db2dfcd92dc5e431e3
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

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://bologen.ru/123?utm_term=macbeth+act+2+reading+and+study+guide PDF link annotation
    • https://cdn.sqhk.co/munuluxel/sVFjegg/12130494642.pdfIn PDF document text
    • http://lnstagramcentre.net/game_car_racing_gamephi1h.pdfIn PDF document text
    • http://guxetiz.22web.org/wahl_trimmer_guide_comb_set.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/FijZjbt/royal_family_dance_crew_members_2015.pdfIn PDF document text
    • http://trysoda.pro/379908716615pfha.pdfIn PDF document text
    • http://nunamekom.iblogger.org/borders_for_a4_sheet_black_and_white.pdfIn PDF document text
    • http://ru-en.xyz/89458958508hpwvw.pdfIn PDF document text
    • http://idealica-ituficiale.website/60332312756q4mnl.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/khdifjc/jabujawax.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/geu330v/general_knowledge_quizzes_for_students.pdfIn PDF document text
    • http://workbykoder.xyz/nigizilijebewelogvd0jm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimiromomekex.epizy.com/simplifying_radicals_with_different_indices_worksheet.pdfIn PDF document text
    • http://pawubiba.epizy.com/77944162400.pdfIn PDF document text
    • http://pinezininefos.epizy.com/56772580466.pdfIn PDF document text
    • http://dexifuv.epizy.com/98541149256.pdfIn PDF document text
    • http://bopenakonaj.rf.gd/42522430453.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/37813092620.pdfIn PDF document text
    • http://pixoriwabivonol.rf.gd/vadimavar.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5548 bytes
SHA-256: 605df84dcf4dcd1324e84cb7583e31f2847b1ba9fc433bf1c395c08680fe873a
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10300 bytes
SHA-256: 725322e322a8e05eafbc0876643c99b8b5daaf30bc59e127b4006fdf6f0acd14

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