Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd972d5a4bc1093b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 05:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8057c6cf0a04757008cca85149589f23 SHA-1: 06f482b5970b85279a548e4cb8f5e71c38420a26 SHA-256: bd972d5a4bc1093b9daff334e1ad2081b7cfff3dc567d401f08772e3c43e4ecf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a PDF phishing lure. The document body, though heavily obfuscated, suggests it's part of a link farm designed to redirect users to various PDF files hosted on potentially disposable domains. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=speech+recognition+for+android
    • https://rachelrom.com/rescontent/file/38621687554.pdf
    • https://smobiil.eu/userfiles/files/jitedefagi.pdf
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/32173981328.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/37841752792.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/woruzuvaninoxuv.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/12/xopiwodozi.pdf
    • https://lecachet.fr/docs/files/siwebodejirakilemile.pdf
    • https://qian-ho.com/upfiles/editor/files/57056102471.pdf
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632149672.pdf
    • http://cassotech.nl/site/data/ws/files/32568646837.pdf
    • http://ferien-in-zahren.de/images/file/tuwonuxudivasuziripulafi.pdf
    • http://lamorenj.com/userfiles/file/27495653467.pdf
    • https://la-klamm.org/Files/files/xaxezagovon.pdf
    • http://kvbm.org/pds/userfiles/files/fofofoma.pdf
    • http://kemnhapkhau.com/upload/files/10163577417.pdf
    • https://universal4shipping.net/userfiles/file/vemakurabovoja.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/gafevos.pdf
    • https://aljazeerahdrilling.com/userfiles/files/semeruv.pdf
    • http://cafehinglung.com/uploads/files/xironazerime.pdf
    • https://ratoempat.com/contents/files/nozamis.pdf
    • http://kargo-box.com/uploads/files/13119679350.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kauft4v27t19pdbq1hg9p4pku7/mawinawovu.pdf
    • http://donghozibistore.com/luutru/files/62175088137.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/35068458092.pdf
    • https://www.naabelectric.com/userfiles/files/6082613186.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_off0000dd42.bin
2e7f742e081d1baea2631a419ea6e58cf164282ae6446163d2fcc77594bcdd7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 18056 bytes
font_01_sfnt_off00010c49.bin
d38f0d4d2232152239a476038d55a38a4bc9e37427ecc4e046e4a4f027893b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C49 10760 bytes
font_02_sfnt_off000124c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes

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