Malicious PDF — malware analysis report

Static analysis result for SHA-256 774e07ccaa272387…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 19:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 246017d8051f34621751495bc4ce8145 SHA-1: a8a037364f5097d9cb2eda2185b8f4f85a6cdc97 SHA-256: 774e07ccaa2723872605f213fca624220d1fa0b94143b688e0b2ccd966838cd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a link farm strategy on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=list+of+economically+important+insects
    • https://burstallconrad.com/editor_files/file/komerakofame.pdf
    • http://zhfangyuan.com/uploadfiles/files/6235887451.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/85561697217.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/15093772290.pdf
    • http://dr-temt.ru/images/file/61073996449.pdf
    • https://evrenmentese.com/upload/ckfinder/files/julokoz.pdf
    • https://alperbehang.nl/userfiles/file/53156464078.pdf
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/bovanitonejolala.pdf
    • https://pyccenter.com/images/Upload/file/firezifopapogeroseguw.pdf
    • http://studiomistretta.com/userfiles/files/sumosuxor.pdf
    • http://wskinbody.com/data/boardData/files/biribadixikunivupebunofe.pdf
    • http://alacarte-husum.de/userfiles/file/2018529518.pdf
    • https://almuhja.com/ckfinder/userfiles/files/bibonum.pdf
    • https://halead.com/uploadfile/1632379741.pdf
    • http://machulski.com/public/file/towegevegorivux.pdf
    • https://pomtco.com/technical/files/file/powinegifupekubofawas.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/pufututel.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614c77701d855---rebujaduworaxirirotaveder.pdf
    • http://dayou.tw/uploadpic/files/202109012258206890.pdf
    • http://steakpluspizza.us/userfiles/file/7870450134.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9e29186c2c31a8c46d17d5eb3986d577/nexitajagipawibasigexumo.pdf
    • http://hoya889.com/upfile/files/20210909214518.pdf
    • http://ciskmv.com/css/file/37004570999.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210926_C9FB74F45F3362F6.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_off0000b07d.bin
cb4ed1e5ddd71a8b3666290b604e043746121c2a1b9be84c45c0fc7806e5dcfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07D 16788 bytes
font_01_sfnt_off0000da98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 16792 bytes
font_02_sfnt_off0000f2af.bin
354a95c09bb9e17062cd7a4228b68fcd3f897aa9f9280aad85924ad8ffafc976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10712 bytes

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