Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ba7d622de5403e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-11 23:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1238a1263ea1fce5e6587e3672808199 SHA-1: 00a4883188e315df84a5075a650c5bbaf3d598bb SHA-256: a2ba7d622de5403e2506503f2b5efc437b34a803c9816b0a8227ae8e9c6b3fad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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=japanese+insects+list PDF link annotation
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/gunelobazed.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/xuwupatulor.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12064068084.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///kugujifidopibiwov.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/lizekagegesevode.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/52312230822.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613029f3e21e1---5250949742.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/negad.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/19822463502.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/75917820838.pdfIn PDF document text
    • http://groupkaishan.com/d/files/jumakaxajoxedenegobabed.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/xupisotidarulonufese.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vixugo.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/88905007837.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/10240123168.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/37370409340.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/77812660105.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613321549eb1e---fewalu.pdfIn PDF document text
    • https://dalba.net/other_files/File/tivukixipujujanobateso.pdfIn PDF document text
    • http://guowangcable.com/d/files/95819587993.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/balokopafefezojiva.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/jinawiroxuka.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/42930372273.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_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 16196 bytes
SHA-256: 8ab5c568ab87e741bf645189752df7068cb23c6bb630cc630f118b9739e2fd55
font_02_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 10140 bytes
SHA-256: b5f35b287b5d8b1fc0606505b1dd85541e115cab7a9ce633757d0b9143ebd1d7

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