Malicious PDF — malware analysis report

Static analysis result for SHA-256 f293f1e51e1338e1…

MALICIOUS

PDF

84.2 KB Created: 2021-10-05 08:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac2c24d9c011f687309fd7c0df4ea7b1 SHA-1: b733023bbafc76f1e1bc83cd2b88f23580dc5cb4 SHA-256: f293f1e51e1338e11b30d4d32970a01af50ebebe6eee78d3902f69b236a9d907
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous disposable hosting domains. The embedded URLs and the nature of the PDF suggest it is used to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=how+to+solve+polynomial+equations+in+factored+form PDF link annotation
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/14a1b82a120896b25d9ade94d02b3bac/nobiduduwenufujomawe.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/zotidevisudodupaledo.pdfIn PDF document text
    • https://phunhai.net/upload/files/51819004015.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/75143571851.pdfIn PDF document text
    • http://hanifeugur.com/image/files/81119603297.pdfIn PDF document text
    • https://tfpac.com/nbloom/fckuploads/file/16080214515.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85463182719.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/rewiwudoses.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/nonapi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615108db49f85---22278980110.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/12549146697.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/6421201066.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/86135484731.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/67096117149.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/53390457412.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/pifugo.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/41743596358.pdfIn PDF document text
    • http://donghotam.com/luutru/files/56866839294.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/14913489290.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/72116437564.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/wemewexazuxopi.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/202975882161539c4b12a11.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/40782792873.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vavugenogolike.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/razegotoba.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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 18608 bytes
SHA-256: 5bf181413d0fa581b6a02583c569d5936aefba41cca570c0b30f27fe1c920cbe
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282F 11284 bytes
SHA-256: ae09d65455afd8952f02926736ef52d7fcdaf9f59f32ce74c54529cf61b9e000

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