Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8ba57bd16eb369…

MALICIOUS

PDF

102.5 KB Created: 2021-09-12 04:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f4c6f6a3b320535b43412a6b8397078 SHA-1: 488c0a34f69efc4070d90dba4675a93511528032 SHA-256: 6f8ba57bd16eb3694383742c207f29d2a776e7b1d4c2e715b971fb1eb5332807
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kaizenlife.com/ckfinder/userfiles/files/tewakivuvojujemigig.pdf
    • https://yesilkoyluleriz.biz/resimler/files/75575520619.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/74591960328.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90493797e---dojirir.pdf
    • https://newdesert.pl/userfiles/file/kuzixakezivijejap.pdf
    • http://obkladacstvikolar.com/content/vovapikekide.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/91962342896.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/tuwuxenojuwuse.pdf
    • http://silverspringabw.com/uploads/files/48973054299.pdf
    • https://hondaotohaiphong.vn/upload/files/rejumefotifujepevijate.pdf
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/35388432849.pdf
    • http://broadgatecapital.com/userfiles/file/86158395077.pdf
    • https://duvarkagidierzincan.com/userfiles/file/ralasason.pdf
    • http://cainghienbinhduong.com/uploads/userfiles/file/nowuzopudi.pdf
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/raxikokuzeb.pdf
    • https://ezsprinting.com/userfiles/file/nupopevonajotifudo.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/sovuziperusonujuj.pdf
    • https://pioneerlift.com/upfiles/editor/files/sisepijetezudolew.pdf
    • http://sinice-rasy.cz/files/file/41164390152.pdf
    • http://travelbilet.ru/sites/default/files/file/vofukefizeref.pdf
    • http://jumpstart.mobi/userfiles/file/33033026383.pdf
    • http://sumosushingrill.com/uploads/files/levatusi.pdf
    • http://fleshlight-tw.com/userfiles/file/desegunusulajumovuse.pdf
    • https://viceda.com/userfiles/file/kixesuza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=xperia+xz1+rom
    • 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_off00012d88.bin
81b350e8bb3ed586dec98e75269c624cfa614d9f396344ca75ac08f208686dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 10216 bytes
font_01_sfnt_off00014474.bin
d33a4a020b70c859b9826f0b1f56c1d8ce0a9166ef207688d3817882d5595053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 18348 bytes
font_02_sfnt_off00017449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17449 16792 bytes

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