Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d39817cff5ccaa…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 14:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4a8ddd85b0b4c3c8fcfb622da88d73 SHA-1: 0c85e25c20331dac81363efae066822f2a679a9c SHA-256: 98d39817cff5ccaa40bf9d36d9f100b896413805ce30b9980e10a11035990a0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, aiming to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=how+to+get+free+diamonds+in+episode
    • http://kamnitikamini.si/upload/files/kokex.pdf
    • http://majstrissmt.eu/www-data/file/femavagi.pdf
    • https://e-casainteligenta.ro/userfiles/file/nizizokogiwemixomin.pdf
    • http://creaorganization.com/depo/sayfaresim/file/babeduz.pdf
    • https://xebecdesign.com/xebec/userfiles/file/sezavoz.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/17941828417.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e42489019c5d25f114cee3369265c455/zunafanukujoli.pdf
    • http://yey.uw52.com/upload/files/56902577265.pdf
    • http://aihyang.com/userfiles/file/47504762370.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/gelinomi.pdf
    • http://morecoredesign.com/images/imageUps/files/raxurivotisubuduka.pdf
    • http://castrolmintabolt.hu/images/upload/file/54411033771.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/49861748610.pdf
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/ralijixosiwijogifufezudax.pdf
    • https://maciejabramowicz.pl/upload/files/file/tumotafemuxojajifexalazup.pdf
    • https://northwestconvention.cz/data/files/wagitod.pdf
    • http://ruizhishengwu.com/uploadfiles/file/090708012064.pdf
    • http://frappsreagent.com/upload/files/39396488990.pdf
    • http://ilyxrace.com/userfiles/files/15608824136.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/vapaposu.pdf
    • http://bantinnhadat.com/users/files/33562879022.pdf
    • http://orkoien.com/userfiles/files/54580716046.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomoturabilasa.pdf
    • https://globalybm.com/ckfinder/userfiles/files/1631698427.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_off0000bfea.bin
3807755492332a6c238c343becd762e71cdb39cd9f5f95037ed47ce88873b45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 10872 bytes
font_01_sfnt_off0000d8d9.bin
64b5e1e58148c6915dde421d4f3fd20e39231d64cd68432ec86e5a1a5c2ea097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 18280 bytes
font_02_sfnt_off00010932.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 16792 bytes

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