Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13f28e89d7d368f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 17:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6442ebe252b41b4e8c7b88332833efdf SHA-1: 86158c76814f128aef90b7b1bf370bbeb9f3774e SHA-256: e13f28e89d7d368f9d01e65add3229dc789ed3c8cbe953bea721a7cd2a73aac6
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of these links and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://mega-gold.com/userfiles/files/2936127880.pdf In PDF document text
    • http://styrexon.cz/userfiles/file/74519392929.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/24098477556.pdfIn PDF document text
    • http://ndt-ultratech.com/files/sofajokuzukuruno.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/57427777126.pdfIn PDF document text
    • http://orem.mn/uploads/files/votunevoxan.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/jibajivivapolofa.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/batazugibufomaxumominoma.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/10475191137.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/letuwoxajoxawonidajepoj.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/80468671024.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/62901100180.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/gelebaxiwutegivenipof.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328b334bc49---10161116750.pdfIn PDF document text
    • http://bienbao.net/uploads/files/tiruwota.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/45139403737.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/nufasewuxifevaliwo.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/togozuxekakakimivomizip.pdfIn PDF document text
    • http://xyoaa.org/sites/default/files/files/73703213002.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9257347bb0993eb76bd6c1c22c8a6f69/74318131753.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210904064934.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/15649305692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+the+apk+file+in+pcPDF 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_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 15952 bytes
SHA-256: 270995ab8183064454406428316db21ec9fa29c874efc1e468f4c0d33b3a75c1
font_02_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 10480 bytes
SHA-256: d64479ac238c9b1833dc43ccfeb63f6517d168f9438509857637f3c823c21746

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