Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc7ac660a695733…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 03:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf085a54a3c038dc4944dbad668abdfd SHA-1: 91605d27ac2d847a8bd3571e619e26676448aa44 SHA-256: 1bc7ac660a695733fef48599f065bec3be59286f605db6c63dd32b04d633d2f8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URLs and a heuristic specifically identifying a 'Callback phishing phone lure' strongly suggests the document is designed to trick the user into initiating contact for fraudulent purposes. The document body was heavily obfuscated and unreadable, but the heuristics provide sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=why+is+my+android+charging+so+slowly
    • https://vanphongphamhienluong.com/upload/files/86403797220.pdf
    • http://mundialimportweb.com/userfiles/file/23525354585.pdf
    • http://skulpt.in/admin/uploads/file/20270443565.pdf
    • https://rawoctane.com/uploads/file/baruvosinorafibusamaj.pdf
    • http://hightopeducation.com/cms_uploaded/file/57325133375.pdf
    • https://premiersuli.hu/files/files/25514784372.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/kifaxigomij.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/zejemetinas.pdf
    • http://sunrui-ti.com/d/files/vonodetarafexuzerimuzesul.pdf
    • http://bettaletroom.com/file_media/file_image/file/teperipalobobujuvu.pdf
    • http://sun-apartments.pl/data/pages/98178772.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/vujewa.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/91854420169.pdf
    • http://domusanna.it/userfiles/files/ziwagoduza.pdf
    • http://zlhk.ru/upload_picture/file/82312331912.pdf
    • http://asirakademi.com/resimler/files/kidogijata.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/17291991368.pdf
    • http://balaton.varosom.hu/userfiles/files/48013310377.pdf
    • http://intertexmedical.com/userfiles/files/83906935418.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/1753826109.pdf
    • http://orderleesushi.com/uploads/files/bofopobisul.pdf
    • http://dostrojar.sk/UserFiles/file/55810972879.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/93972157667.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_off0000b306.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 16792 bytes
font_01_sfnt_off0000cb18.bin
9cd96f740113d1bc1cac02496333256cbc073fcd235623dedb7f820ba742704d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 16428 bytes
font_02_sfnt_off0000f56a.bin
20d950088dec153a5d0d047d3859b4f0a163347ba162c176abdd6a056e5e9463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10780 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.