Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce5da02716a5860…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c13bbba5b099b074d25e27a2e040e48 SHA-1: f659280dbe0c87ad57b3ff6f5cbd91302b3f85cb SHA-256: 8ce5da02716a5860e78ca22593c5a3fd419020f4e71ffb21587f9454554693c6
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, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rmp-traueranzeigen.de/cms/files/dapedulenamoxevomonarag.pdf
    • https://hospvetcentral.pt/site/upload/file/limurobiwebakixotez.pdf
    • http://peak-experience-japan.com/images/blog/file/92605032838.pdf
    • http://mikomisushiwc.com/uploads/files/weburokafepukelisapop.pdf
    • https://pachetedeturism.ro/images/files/63080764861.pdf
    • http://gurukripapublicschool.org/userfiles/file/xerow.pdf
    • https://arhometutor.com/userfiles/file/5863528321.pdf
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/86435140710.pdf
    • http://flynewsletter.com/uploads/file/69305024261.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613583ee1b05a---mimikuwinuba.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/49508998880.pdf
    • http://synphabase.ch/upload/file/rarotagujikedunuziw.pdf
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/50499805992.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/pebati.pdf
    • http://wwstationery.com/files/file/71722242510.pdf
    • http://telek-trans.hu/editor_up/jirinatomadunalo.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a20e359386d7f69be89ef6beddbb5c2e/38645237924.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/zabasa.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/51863483143.pdf
    • http://dienlanhhuubinh.com/upload/files/30348455441.pdf
    • https://grouptm2.com/contents/files/dolada.pdf
    • http://beiks.info/public/file/27186885034.pdf
    • http://popmetre.com/news/files/78100149497.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=putlocker+lucifer+season+5
    • 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_off0000db9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 16792 bytes
font_01_sfnt_off0000f3b3.bin
98d01fccb6e328008a4e65d88cb977695e0c930328d93cda84cd13dd38f1ee8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10656 bytes
font_02_sfnt_off00010c59.bin
2dd45c98d89ba7e8341748febbbb36e840a5c6ed28939fa56a8631a76ed6fddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 19632 bytes

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