Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e8d602b4ce587…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 07:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43e79ff52df5ab0bc3035f5ef5fd1118 SHA-1: 8e61c7f4af0caa5d6a605459802c7d90b727add6 SHA-256: 756e8d602b4ce58734b951b882ca17efc639a221ac35bfbc33f5e354502d2fbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://winpoasia.com/ckfinder/userfiles/files/87290803225.pdf
    • https://ventadeterrenosagricolas.com/userfiles/file/71117809231.pdf
    • http://linhkienhunganh.vn/luutru/files/52690938160.pdf
    • http://humanlitech.com/files/files/janezumiturojodotetijiri.pdf
    • http://kxxbs.com/uploadfiles/file/a/ranafokajanan.pdf
    • https://soenen-pneus.com/upload/file/zexerusapudewafunojujev.pdf
    • http://tidomusica.com/uploads/files/202109031621129964.pdf
    • https://dalycity.com/wysiwygfiles/file/relizexo.pdf
    • http://vertex-decor.com/userfiles/file/tobodevebugir.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/15370285179.pdf
    • http://cukiernia.eu/upload/files/sevinufof.pdf
    • https://adepotcustom.com/UploadFiles/file/20210913114820198.pdf
    • http://sluchatka-shop.cz/files/upload/files/wefuxadibatesawosanal.pdf
    • https://marblo.com/app/webroot/img/files/42061169706.pdf
    • http://evo-models.com/uploads/userfiles/files/suwigazuzosabokujutu.pdf
    • http://alacarte-husum.de/userfiles/file/91927359845.pdf
    • http://chikatere.com/Upload/files/pamixaxu.pdf
    • https://dnmpaint.com/sdcc/images/file/6484766727.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/89637614847.pdf
    • http://eshop-kocicinadeje.cz/files/file/wugokulibejelanugeka.pdf
    • https://etadelloro.it/images/file/14084957560.pdf
    • https://pepsima.biz/files/file/bumigi.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/50191394926.pdf
    • http://shoreluxurylimos.com/userfiles/files/lepirufubufovodinegeraku.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/bidujik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=entre+nous+2+pdf+free+download
    • 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_off0000c65c.bin
36437e12f7b4cc9c5c1d381a37dc84461b4b857f7c15d174296df16a4f935821		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC65C 18632 bytes
font_01_sfnt_off0000f758.bin
da4b92ec92a447f98218e8861feed7f5013931e94fd9dd63f499d27ee3f03c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10688 bytes
font_02_sfnt_off00011026.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 16792 bytes

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