Malicious PDF — malware analysis report

Static analysis result for SHA-256 5252f894ee10dc69…

MALICIOUS

PDF

76.8 KB Created: 2021-09-22 09:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: deb2616b6fb3614d65f95df8cdf92d17 SHA-1: 0c5b106b4196e06e195df86673e60a5742174da3 SHA-256: 5252f894ee10dc698f907a513416d0e7a3a9f579b1ff59bb4c43e59d72c236d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dream-mebel.com/pic/file/nujagumud.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/61641823764.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/73ddef542f8de49e7b363b6dcbbdd9c7/xuvepoduvorakufavijuk.pdf
    • http://imi.vc/upload/files/zebolib.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/xuvafoxan.pdf
    • http://urgentcarepb.net/userfiles/file/konolasekoroj.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/68398292544.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/fawis.pdf
    • http://wonikqnc.com/upload/editor/file/1631238536.pdf
    • http://dichvubaove.online/upload/files/napobasuwomup.pdf
    • http://immobiliareborghi.com/userfiles/files/widinakojejagexusuro.pdf
    • https://lotteppta.com/beta/assets/file/nomalegu.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/kajefototabomewikepetowa.pdf
    • https://rippa.pt/files/file/85502194099.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/12031185927.pdf
    • http://webs123.com/userfiles/file/23345995135.pdf
    • https://mosallaesf.ir/uploads/ck/files/23163592315.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/xukusirojutosexum.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e32bc01a3---62672552968.pdf
    • http://damnoen.com/ckfinder/pho/files/tabalolirujemibu.pdf
    • http://allineers.morefriendship.com/upload/files/witanul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+phone+emulator+windows+10
    • 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_off0000c6f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 16792 bytes
font_01_sfnt_off0000df09.bin
61ef0047eab682f58d73bf743ab26f0fee6b0097833af57a6c34ca6d05533d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 11000 bytes
font_02_sfnt_off0000f877.bin
7c69eea31bb51773bfcfa47d53e580cb7a5114219212df92db5f2805165a8241		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 17436 bytes

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