Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1631970ff38d467…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 06:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deae68e6ed6f1bdf290c1b65cb6aa6b5 SHA-1: 5047608ba3f01c2509f29b7408c06fd12b6fff89 SHA-256: b1631970ff38d467d985441e2070cab673dfa4704c333120ba952bc3e2d1afe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=page+crop+pdf
    • http://malir-naterac.info/UserFiles/File/renoxukuwizapono.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16138b66325861---gebug.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/zofadetebezugusopox.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/31971547208.pdf
    • http://unchiulmihai.ro/files/fckeditor/file/nilinawofev.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/towawajikupomeduviw.pdf
    • http://soft-pro.hr/upload/datoteke/37984193760.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/mejorejijajakikuvoju.pdf
    • https://mmszke.hu/files/file/vefabuto.pdf
    • https://nevisnews.com/userfiles/47040157615.pdf
    • http://lineshare.net/upload/files/20210907165827.pdf
    • http://hani-bee.com/userfiles/files/jobegivisuzazukuse.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413916dafa8---sadexuj.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/67196776186.pdf
    • http://denetimmusavirlik.com/userfiles/file/25370425041.pdf
    • http://giftboxvietthuy.com/upload/ck/files/fugaruguzosamuxurogela.pdf
    • http://newgrids.com/userfiles/file/giturixidabiripegirogur.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e0d3afbc---39151134885.pdf
    • http://linhkienhunganh.vn/luutru/files/39840148501.pdf
    • https://alamansyria.com/userfiles/file/90746316629.pdf
    • http://vetusmeter.com/images/upload/File/13259459539.pdf
    • http://thebrownbag.vn/upload/files/tidatod.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_off0000d4e3.bin
8e14dd267de2874ae034dd3476d0598d806b616327ddba698b25ccb4f225032d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 17400 bytes
font_01_sfnt_off0001018f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 16792 bytes
font_02_sfnt_off000119a6.bin
c05ff7b9101fd75b9d679fb475cbee3fc2dd7a3ba722ea8294a754387defefad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 10288 bytes

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