Malicious PDF — malware analysis report

Static analysis result for SHA-256 299f1dcbadec8326…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 13:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f91b87f5ba3be18dafd5462985a7372 SHA-1: b79a69a3cf19e5e0a21bebf4f4f12427274fb7df SHA-256: 299f1dcbadec83265a10bded267d6598a0b505add56486f6fda23b298b6e3c1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to suspicious domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic of using many distinct, potentially disposable hosts to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pbpkrosno.com/fckfile/kebabilimisexepuwosomowu.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/jopibuten.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/33734370722.pdf
    • http://chenruichem.com/upload/files/fijijonefop.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/sikutib.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/mufewesukaxokarapi.pdf
    • https://deltarealestate-eg.com/userfiles/file/79145423553.pdf
    • http://studiozoppini.com/userfiles/files/dopumobajijejemibe.pdf
    • http://baodieptailor.com/uploads/2021-09-14/images/files/muwasotutusi.pdf
    • https://sunarchegypt.com/userfiles/file/lovodegojiz.pdf
    • http://alrehabourhome.com/userfiles/files/63345388004.pdf
    • https://jordan.si/dokumenti/file/34283877371.pdf
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sudexogikumubazikimem.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/75398769698.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/12972790703.pdf
    • http://itemclinicchina.com/ckupload/files/52883042767.pdf
    • https://virtrade.gr/userfiles_lybo/file/nazapuvolusanuxufizef.pdf
    • http://vanprodukt.cz/UserFiles/File/luwasukiju.pdf
    • http://semanbio.com/upload/files/81317540497.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbeaec24d---tivilobup.pdf
    • http://labuchedeberce.fr/userfiles/file/14266083100.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/boranajerudosewokugamoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+find+a+keylogger+on+android
    • 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_off0000dbc5.bin
f4d5b3aae3135115dd5681ea273179e1f3578a42a71763f07e0cf2620f0eeee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 10644 bytes
font_01_sfnt_off0000f405.bin
8a8589773b6ffa48f44201b3bf21b253a6a49535b8f125d6a3fc5ddcbea3ebdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 17348 bytes
font_02_sfnt_off0001207c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.