Malicious PDF — malware analysis report

Static analysis result for SHA-256 879d590f1c5a12b9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 08:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9373574fd421c9527a6cf615eee4c22 SHA-1: f4184539c250dc4e41c1fa9ce5db16808ac1ff60 SHA-256: 879d590f1c5a12b9f4ad067d04dcdcff03644a8004bae9859a9e8090eb9293b5
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing attempt, likely to trick the user into calling a fraudulent support number. The document body is heavily obfuscated and unreadable, suggesting it is designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=pes+obb+patch PDF link annotation
    • https://southwestlooms.com/admin/userfiles/files/99297570192.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/fipufuvemodori.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wazigofi.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/sogovapuwolojewexeroja.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/11996018556.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pizoze.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/29492811793.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/26420469477.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/74918438902.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/2693977486.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4495c138---fujuwuwuti.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45216330588.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/55048026649.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/laxubigik.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/litixaw.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/33635070258.pdfIn PDF document text
    • https://harom.ro/files/file/24067128822.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/jibodewevorijix.pdfIn PDF document text
    • http://iknow.pl/files/file/felolilakizatozobujifokut.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/dofufot.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/37338507171.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/80559844144.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/56851771199.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d0843f5753df0c35067de75837fafdca/44816594564.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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 18340 bytes
SHA-256: a3c87ecf2e1722153141606190aebbc5c538051e7517d66d6996099eb2243ac5
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10272 bytes
SHA-256: 674fa50aaef8f2b436a2455153874eb0c6b3b7000cab0e384d1788f8090ce0e3
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1