Malicious PDF — malware analysis report

Static analysis result for SHA-256 1963dc6dd0b9a857…

MALICIOUS

PDF

73.6 KB Created: 2021-02-16 22:52:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2710ccf6eca36ad4c9e46c10a39b8211 SHA-1: 96e0b48907af35da10ec485bd9fb8913c5627f31 SHA-256: 1963dc6dd0b9a8570bba527d0e04eb576c7f83d47f728d09f6591bf6bbdcb722
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 hosting, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, indicates a lure related to 'common phrasal verbs in English', which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/strik?utm_term=common+phrasal+verbs+in+english+with+meaning PDF link annotation
    • http://justiciaforjustice.com/dewey_quotes_education_and_democracy4jja9.pdfIn PDF document text
    • https://lonamoki.weebly.com/uploads/1/3/5/9/135964194/006aa905e.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/dG2hflH/berserk_chapter_360_release_date.pdfIn PDF document text
    • http://7lessons.fun/1862299282grxan.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/706553.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/d0jdz3W/a_tiger_in_the_zoo_poem_summary.pdfIn PDF document text
    • https://rekizutor.weebly.com/uploads/1/3/0/9/130969391/320a52432.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/ed455.pdfIn PDF document text
    • http://anyita.space/minecraft_pc_free_1._126m9xz.pdfIn PDF document text
    • http://neojust.ru/rockefeller_street_osu9nyg4.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/jjNiihb/disevuvokoradexafikawefoj.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/bomit.pdfIn PDF document text
    • http://xiravudes.22web.org/nagagizux.pdfIn PDF document text
    • http://puzobegenoneb.iblogger.org/skf_thrust_ball_bearing_catalogue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patotale/cost_accounting_guerrero_answer_key.pdfIn PDF document text
    • http://gojexigubobe.epizy.com/mixed_conditional_sentences_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/index_form_worksheet_tes.pdfIn PDF document text
    • http://bofisul.rf.gd/59095037764.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_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 5432 bytes
SHA-256: e2961d61706c9a20c2268465574ae61f0af02c43b3d2fc9aa4517f6c9b426345
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10004 bytes
SHA-256: e1dcb984f66259c8131bc0ce660fd2f94485065e9881c28f01af22a791de5780

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