Malicious PDF — malware analysis report

Static analysis result for SHA-256 409e410d359086f0…

MALICIOUS

PDF

87.4 KB Created: 2021-09-11 18:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e5e59808992f8e29076b795e801491d SHA-1: 31af74fd927e4a619240ae8688fe2c0d10bbc29a SHA-256: 409e410d359086f03c0e0330ce208d02940b92f00b7910c5af4629c0eb4ef6c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external, often disposable, domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the presence of external URIs suggests exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=hulk+game+android PDF link annotation
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wafazabularawis.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/60272278711.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/60790108830.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c02348de69a068df6be2fef236e4d97a/99566806031.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tubedifovimetivut.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/valafakupubejorolofuxafu.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/27171930873.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/40207463918.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/51781469241.pdfIn PDF document text
    • https://thehouseproduction.net/file/demetufasapumaluzedabamo.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/wexusinokexulux.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/duxuzumokexisujosir.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/zisonikagenufebatuda.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d51c83b81---xukadomabe.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_061403.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/rizomaridepazeton.pdfIn PDF document text
    • https://totounited.com/contents/files/befemikegazuwoxogepasekej.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/xepejinuvinuliwizumogaja.pdfIn PDF document text
    • http://status.cz/UserFiles/File/fovanobifedijupanowi.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/34140228067.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/35773217692.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/74081268325.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/sizekiju.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_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 10508 bytes
SHA-256: 00c05a773aaecfe8f833935081955e9e265147b08eabda0c7693519fbd2156b0
font_02_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 17400 bytes
SHA-256: b5231a24ef75a243eee953017a148cf3d3afbfff11d499fce2d5a5417c00e4c9