Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef95ba5970e528a2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 20:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5451f934c2fe5e8284009a2c93729d2 SHA-1: f72e45ea4699049e3c8227ef8d20d2e0eeeebab2 SHA-256: ef95ba5970e528a2b7f323ff3fdb116c3b4b93a2bcce5b57ff8c279ebccc2d2d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly indicate a social engineering attempt to solicit a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=open+source+android+email
    • http://15449010.com/FileData/ckfinder/files/20210903_C6AB6F78368530AA.pdf
    • http://mestav.sk/uploaded_images/file/jumososusujejuvasi.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141d92ecbe76---19927969906.pdf
    • http://grabnerestriche.at/57731229040.pdf
    • http://yonseri.org/userfiles/files/96755142848.pdf
    • https://bahceneryaman.net/public/content-images/files/9455032208.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdf
    • https://swalaya.in/userfiles/file/72477607658.pdf
    • http://dytac.hk/userfiles/jamosurasexolepez.pdf
    • http://bamboomfi.com/htdocs/cljr/data/files/wavana.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/pezusutevugubetudodew.pdf
    • http://simpelms.nl/userfiles/files/mizubeduxijojadiwatowev.pdf
    • http://chroscina.com/userfiles/file/vibejixevipijobu.pdf
    • http://idominjazz.com/fckeditor/userfiles/image/sitovufopilimibug.pdf
    • http://mesterteto.hu/userfiles/file/98346403688.pdf
    • http://elma-itc.ru/!upload/files/91366524734.pdf
    • https://cornwallstaffagency.com/userfiles/file/vesoroninituwawet.pdf
    • https://vinocastillo.hu/editor_up/jurezaka.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rikeruramuwizijexi.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/41958471126.pdf
    • https://binarbaid.com/public_html/userfiles/file/lezelubifipidafav.pdf
    • http://kursadowicz.pl/Upload/file/pivodabekunakafofuge.pdf
    • https://lompatjauh.com/contents/files/maponejafojukujugidu.pdf
    • http://tiquital.com/documentos/file/gitep.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/gogotepokubiradozuxabama.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_off0000d9c7.bin
5459a44fd0e27edcbf7a01b32c4ee0b4ad8ad71bdde053de733ef5832a127b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 10704 bytes
font_01_sfnt_off0000f249.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
font_02_sfnt_off00010a5b.bin
a5bb3565900b8cfca7c6cdf2dff385c75d7e506ca6f47511e26eb13e6617474e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 17168 bytes

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