Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4e3d0619789b99…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a09c83b191e26f72f45dc2fc64eb7d3 SHA-1: 5986c1199c16ca1e231deaf3a76b206b1abc1f1c SHA-256: 3c4e3d0619789b9906ec33807176c2522f328fc65b64db9f08940ea6735b6288
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=how+to+connect+phone+in+mi+tv
    • http://giasuthienphuc.com/Images_upload/files/womuratisumawodesidupet.pdf
    • http://meghdoothsuzuki.com/uploads/243781345.pdf
    • http://lukasikgroup.pl/Image/files/zujuter.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0bdad93c1---40906613048.pdf
    • http://perevodvnegiloifond.ru/pict/file/27390565621.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613918ffa2b43---38681503646.pdf
    • http://lideparts.com/userfiles/file/1630742585.pdf
    • https://hchoanglong.vn/userfiles/file/30830387844.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/vejoxutegegojalofifumoma.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/fanojuwikunubodinazemadim.pdf
    • http://parkingparts.com/Upfiles/file/mitozam.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/bujozifagulebibubadazuzo.pdf
    • https://beltamas.by/content/Files/48211694747.pdf
    • https://bloomlight.pl/_bloom/file/vewal.pdf
    • http://heryeryesil.com/resimlerfiles/dirujowofidimi.pdf
    • https://egokituz.eus/files/galeria/files/gubifegir.pdf
    • http://zekidilektekstil.com/images_upload/files/tenitafanelaziju.pdf
    • https://menu2uplus.com/images/file/nutupimimiwe.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wujexuborunajipa.pdf
    • http://konberdbio.com/upload/files/15586219691.pdf
    • https://qkon.ca/images/file/bimozituzos.pdf
    • http://webminmax.com/userfiles/file/29121414683.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_off0000bb7c.bin
8c1b1b3884591effe7a1866daf4ac0fc4e144767f280b48214e27b85ff3aeb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7C 10308 bytes
font_01_sfnt_off0000d27d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16792 bytes
font_02_sfnt_off0000ea8f.bin
8354a15db69c1eb1bc83fc792a10a06d7b3a660ca0b625b11918887d6235d259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16596 bytes

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