Malicious PDF — malware analysis report

Static analysis result for SHA-256 f646ed6fd129b952…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 05:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a513cfa74f37c8d9aa6c84cd11f1918e SHA-1: 7ca921c2730383abcd639885d0fe155face837ef SHA-256: f646ed6fd129b952823a866d31b97bf66c40bc407436f67cb31322abeabe1418
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malicious content. The presence of external URIs and a link farm heuristic further supports a malicious intent to direct users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=apple+tv+airplay+media+player+android PDF link annotation
    • https://transport-vehicules.fr/userfiles/file/kunolanibupisuravevufono.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/13956939333.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/37101902349.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/wuzomatonudafumifo.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/debufexiduzu.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37881554915.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/dexonogenif.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/mogebamuvadap.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vijamitoxadukogekelukig.pdfIn PDF document text
    • http://popmetre.com/news/files/dajatagujekaned.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/midimozo.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/gowowen.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/patuwuridagasavut.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/simovesigesolu.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/43484859844.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/rigezifaleled.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/jemoxemudiwikasokoxev.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/98333661788.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vokuvowuz.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/7787853795.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/rusagiwejovepijapokov.pdfIn PDF document text
    • https://gencatakan.com/upload/file/morawudigivoke.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/78394705631.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://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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 10548 bytes
SHA-256: 35d1b058745e59830a32f82f590b170b48def3af09628688863dd4f7b510b5f7
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 18148 bytes
SHA-256: 1d2630ccd0af01f471c38a57a021b4104e6b1113d2f243ec0b33608f26e84181
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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