Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bdb793e791c992…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 23:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84ff2e71336839f961df46d6f93f46a3 SHA-1: 3b28a61e7f9383ba7faf8876e6bdb5c53bd02e3d SHA-256: d1bdb793e791c99264870d9f39eec16f59834843c1f7d85edfaf9cc3f6a91c12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://airfa.it/userfiles/file/lajisaga.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/xepapatizusanab.pdfIn PDF document text
    • http://synphabase.ch/upload/file/beximavatubez.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/vazuxusatetumeguwemakano.pdfIn PDF document text
    • http://seamacros.com/upload/file/67746048309.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/53477202029.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210913_081635.pdfIn PDF document text
    • http://c-amc.com/upload/files/57054681701.pdfIn PDF document text
    • http://st03.it/userfiles/files/vobizotofow.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/pelasokogiminizi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4868b7a32---12065324112.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/34462167393.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a9c8df96e---besugazewizurow.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/39955218471.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/76075804205.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/figetodax.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kedep.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/bawipitim.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/6082080945.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/31284591598.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/93615526544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=last+island+of+survival+cheatsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16352 bytes
SHA-256: b9bc1be92b57bcd42b786f46558db9d2da65bc53b8eb7fe4b3ab6b03ccfa356a
font_02_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10696 bytes
SHA-256: c903aa12ee172d97add3b10dc0bac27646694add57ab661e399cfbd3a9b3270f

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