Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe30ec0ca70f635…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 13:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 925ea2faa8685f73980a6bc8e4ba18c8 SHA-1: 0be5d4fcba3bbf3ed00f112cdc8653274c66af00 SHA-256: 3fe30ec0ca70f635ee8015fb4f3893d1f58106e30302aea011704269bd65c82f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is hosted on disposable infrastructure. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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 http://fskyok.com/uploadfile/files/70623888267.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210909_2E0DFD684ECBEB13.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/53221627698.pdf
    • https://greenlandpark.com/uploads/files/7692200517.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uch6a0geq9n7s8rub0jhlte9bv/bavaviraposagu.pdf
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/povegi.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xavez.pdf
    • http://union.travel/ckfinder/userfiles/files/54590131933.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/korimer.pdf
    • http://finadev-groupe.com/userfiles/file/vopurimiserikugeriwofa.pdf
    • http://mimpiindah1.com/contents/files/52574126638.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/25331277174.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/69795667144.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/silejowe.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/tomasatutifekuduzifuk.pdf
    • http://tysons-cafe.com/uploads/files/52407861059.pdf
    • http://arqing.es/ckfinder/userfiles/files/38634521873.pdf
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/29070723292.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613238056a678---bekawiri.pdf
    • http://vetranhtuong.info/luutru/files/37834936624.pdf
    • http://blesk-stroy.ru/userfiles/files/xowuvumujumaxibipul.pdf
    • http://art-ball.net/files/file/76951490539.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/fibumupusuk.pdf
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908001347203008.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+place+to+download+music+on+android
    • 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_off0000b780.bin
0c428e51ac0bfd8f2917919a9577be2e58bfd44e2d1681a96e7a5429b2d4c415
pdf-font-stream PDF embedded font (sfnt) at offset 0xB780 10916 bytes
font_01_sfnt_off0000d0d1.bin
d6630935f44a4b4d5dc1ca78e3fd8010d93267fb389da3e56b993d9058decc19
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 16464 bytes
font_02_sfnt_off0000fb33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 16792 bytes