Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bd4fe9442a5826…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 18:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc409de03a1a8ddd25aa90b893b7212f SHA-1: 45df55b365ac94676397120afccc69cd3587ebac SHA-256: 70bd4fe9442a58263fddb352a5fb8bbadb6b850fc05a9aa4c66917ccdd2f3ab7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to PDF files on various domains, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting an attempt to lure users to potentially unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://megatekspb.ru/sites/default/files/uploads/safowiv.pdf
    • http://mixmarketing.vn/upload/fck/file/33200090389.pdf
    • https://lenaoyunlar.net/calisma2/files/uploads/xunut.pdf
    • http://gaziogluenerji.com/images_upload/files/kifil.pdf
    • https://ppkh.net/userfiles/file/14093958810.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/sexuworuku.pdf
    • http://bebelino.ru/userfiles/file/107514735.pdf
    • http://generale-bureautique.fr/gdb/files/file/5426709945.pdf
    • https://soudurelausiere.ca/upload/editor/file/sanedupolobebosimawapus.pdf
    • http://preciz.com/uploads/wysiwyg/files/kifegoziparemuviku.pdf
    • http://songhandiban.com/uploadfile/file/2021090613342073499.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/23806800132.pdf
    • https://butagallery.com/userfiles/files/jonoziso.pdf
    • http://noithatmfc.com/media/ftp/file/lanoka.pdf
    • http://ecohort.com/userfiles/files/narinikax.pdf
    • http://eclickapps.in/userfiles/files/72870609440.pdf
    • http://dansecyr.ca/pdf/file/10638436748.pdf
    • https://paulogomeslda.com/userfiles/file/mevabofejofegokefesoga.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/75204051383.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/27020362481.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/54224071007.pdf
    • https://fajanav.com/aym_image/files/65402335461.pdf
    • http://bushurov.ru/images/files/92822894704.pdf
    • https://tarsiman.ee/files/file/17630100774.pdf
    • http://c2r.su/uploadfiles/file/2021090902013573499.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=powerdirector+premium+mod+apk
    • 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_off0000b416.bin
e3518eefdf59f565580126d1bab262c1b2ee05333acadd3955a7b564097d710c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB416 10636 bytes
font_01_sfnt_off0000cc8a.bin
6d74e8111139b89f853676d2f04fc985596a7301689eb07aa7dcc5e885f3cb3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 17232 bytes
font_02_sfnt_off0000f8b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 16792 bytes

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