Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56d0be6a575d7ad…

MALICIOUS

PDF

76.7 KB Created: 2021-02-22 12:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b07e3812965bc8473e294e6b724e985b SHA-1: ca3fca812da9fe20291c6d8ecc2131019641f3a8 SHA-256: f56d0be6a575d7ad335fe6b9b7eb5ce7c85b6a5c6d1906cb9c0fbbdca59ed127
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=me+earl+and+the+dying+girl+soundtrack PDF link annotation
    • https://cdn.sqhk.co/lomasamube/joHbsgd/28262882172.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/Ehhawgc/58099596587.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/in_my_room_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390323/normal_6008974e616e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407318/normal_60098d618752e.pdfIn PDF document text
    • http://topijakalez.22web.org/53509891902.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ewigdjg/saxekaveminerafafewawumar.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/i4xgjhc/36903358239.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/hdMhigd/nodegawiwara.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/hdjcl98/buzimosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_602ea0203a12d.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/60516099249.pdfIn PDF document text
    • http://circus.market/modern_architecture_books_free8gzsh.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/VEIpF4I/33513101863.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/hh1n4UC/parent_helper_appreciation_gifts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5fcb329e433d6.pdfIn PDF document text
    • http://tgesheff.xyz/67600833972negcn.pdfIn PDF document text
    • https://cdn.sqhk.co/nasonamav/9ggghjW/monster_hunter_stories_ride_on_season_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_5fe7cb8ddbd39.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/ekgckdX/jimonezafube.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/hcz7jfl/sijudobutizixepamawipov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 5372 bytes
SHA-256: 32cfc357242d12c62770367a5ac442afd13f8233207cfba84bf7479635d01485
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 12124 bytes
SHA-256: 031fd92a0f028ca389ab230ed21d2de2113d3d5381e3171344f52a4b228c8670

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