Malicious PDF — malware analysis report

Static analysis result for SHA-256 9845b6895d09e2c2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 20:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c9498c8ddd24d6d0ec45029d77a0830 SHA-1: ae8b96664650314ad8eeaed90aac23f1b1369240 SHA-256: 9845b6895d09e2c29ae0698502d8e3db3e10eb11671fb238e2cc67cb131f44ff
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 trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=descendants+3+full+movie+in+english PDF link annotation
    • https://samsungdvmklima.com/upload/ckfinder/files/24808734419.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1881ae5e6---64925270857.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/wepuxafurev.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/19357822084.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/57414939480.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a0550c50---legedulatitukezofoduj.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/25733738775.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/56536195498.pdfIn PDF document text
    • https://advik.net/userfiles/file/95176908943.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/63609096744.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/30193795321.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/fagirotawokela.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zewugomusavepexoturive.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/xexaxanixotiguxururula.pdfIn PDF document text
    • http://meskerjager.nl/media/files/63560576474.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/31581018046.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/35654704749.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/gexuluke.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/bibebifodevubosobixe.pdfIn PDF document text
    • http://banquat.com/userfiles/files/noxiwugux.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/fozoge.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/86073815506.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/84552164855.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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 15648 bytes
SHA-256: 5928d3fc5fbcd688cd9ee47b0f48d43fed70bc20888b73504727b7ccc8114a33
font_01_sfnt_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 11164 bytes
SHA-256: 4c2992d6edcc4feb2bb40ffc2fae74aa320857d596d971509056c3e638e06ffb
font_02_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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