Malicious PDF — malware analysis report

Static analysis result for SHA-256 1178cdf37e3f302b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 15:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e45b4ad25d96947ba263333091de67dc SHA-1: 768d09156a9553b190de8eb8df8a5751d92990f1 SHA-256: 1178cdf37e3f302bd3895a4884a8751111e245681cadeba54b7119dd07919b63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dongtienlamnghiep.com/upload/file/62806898712.pdf
    • http://bkm-market.net/userfiles/file/nuzorulosojofedulifu.pdf
    • https://efsanepin.com/calisma2/files/uploads/jufuw.pdf
    • http://campfirewtx.org/userfiles/file/92139909263.pdf
    • https://magyar-logyogyasz.hu/fileok/file/19807737886.pdf
    • http://pastoret.it/userfiles/files/24268312666.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/dugonajabeperotilugewotex.pdf
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/4981948473.pdf
    • http://jogagongu.pl/userfiles/file/pejovekatekedolajijogifi.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3f5cf991---dekiridunuvatubumabiw.pdf
    • http://gotween.com/userfiles/file///keluzajedaf.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/tudokasiri.pdf
    • http://darangyi.com/userData/board/file/dokutagejuzapiba.pdf
    • https://tpk-m.ru/files/file/zumuxekavusezazoked.pdf
    • http://myshopgroup.com/userfiles/files/6574478858.pdf
    • http://vagtteam.dk/userfiles/Files/dodufeziworofo.pdf
    • http://robwalker.net/fckupload/file/15093399128.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/dapitotizoxoxen.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38286886414.pdf
    • https://cuacuonbentre.com/upload/files/44916388906.pdf
    • http://paramountswimwear.com/userfiles/files/42391651920.pdf
    • http://fge-service.com/userfiles/file/wenusizulokemawelaroj.pdf
    • http://obkladlazby.cz/userfiles/file/jujazovetabixirox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cuidados+paliativos+em+idosos+fisioterapia+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_off0000ebc2.bin
b7697f33c5af4c365c7178b4093066a8a830e7ced97238a657e8456fbdbc20f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 10752 bytes
font_01_sfnt_off00010490.bin
3e89e0592ac9b51eeb22c634a7265ab4785b2869f42755481a96275483b9fb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 19868 bytes
font_02_sfnt_off000135e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135E4 16792 bytes

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