Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a7bd93ad229c3a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 06:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d7d1c3cdfccb39b95097f6c251b51f5 SHA-1: a88f5b27d3f958f558eb246b68b3f3fe335cae08 SHA-256: a9a7bd93ad229c3a5a3ed2c383425311776c56046cf86cade3a6282e93eeb2b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it may host or link to malicious content, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crewmak.ru/uplcv?utm_term=pokemon+go+adventure+sync+ios
    • http://nbmounts.com/userfiles/file/1630542482.pdf
    • http://ride-on-earth.com/images/blog/file/36067098529.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/41262447fd196acb826ce2ca069b6315/samusoso.pdf
    • http://ndt-ultratech.com/files/22305751531.pdf
    • https://themis-lex.com/userfiles/files/jujegiforagixajegox.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/novijufizefomerogexato.pdf
    • http://staractivecollection.com/resimler/site/files/41158503910.pdf
    • http://all-premium.com/user_file/files/foledipug.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406ebe67d36---rurokimilovazile.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e243a045b0c062608141826adc585732/10472729994.pdf
    • https://juhaszautovill.hu/userfiles/file/28957851902.pdf
    • https://www.seblocation.com/ckfinder/userfiles/files/purexopekedozerigek.pdf
    • http://dienlanhhuubinh.com/upload/files/27197631945.pdf
    • http://magnumprint.ru/upload/files/kugokadevubapu.pdf
    • http://diagnosticaedilizia.com/userfiles/files/vimipinufogazonifof.pdf
    • http://xedaptap.net/userfiles/file/sosapu.pdf
    • http://be-now.pl/userfiles/file/dojepomozomimanivaz.pdf
    • https://wonkingchina.com/d/files/51316057257.pdf
    • http://salukool.ee/upload/userfiles/file/todanurapupoma.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/wesaloji.pdf
    • http://physio-praxismitte.de/userfiles/darotose.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cb.bin
62ac288a1c67f01a13326f0afc137eb1c15ffcb31e616f6991b85d9003f4167f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 11040 bytes
font_01_sfnt_off0000f367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16792 bytes
font_02_sfnt_off00010b79.bin
e936bbd4254e560b53440cdeb57d235b7cc2df2cd4ca7ca301ab92698e3d68d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 17540 bytes

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