Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cd12b91e48c04a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-23 02:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17c5eb0fd138ea5e985bb65d93441165 SHA-1: 547d062a233468cf5fbc4d6489c3847a4cbd4c41 SHA-256: f6cd12b91e48c04a43005b6d17fcb4b103514c92a9a4d4b9c49cb6d7c0a7055f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=index+of+marvel+tv+series
    • http://nc-israel.ru/upload/files/37216443034.pdf
    • https://kimcert.net/E/file/bonuw.pdf
    • http://moretonassets.net/userfiles/nevodovexus.pdf
    • http://planao.com/ckfinder/userfiles/files/pulujunokona.pdf
    • http://playbabydoll.com/userfiles/file/84123741005.pdf
    • http://sujitonweb.com/userfiles/files/73581644956.pdf
    • https://qigoodteam.com/uploads/files/202109180753284220.pdf
    • https://gbagencement.fr/uploads/file/92140788963.pdf
    • https://zoldlepes.hu/userfiles/file/8984470561.pdf
    • http://fukaofoods.tw/uploads/files/202109092238575808.pdf
    • https://chp-travel.ir/data/file/3900778749.pdf
    • http://vidiniaibreketai.lt/userfiles/file/15589908079.pdf
    • http://tiquital.com/documentos/file/fezolimewetajedabu.pdf
    • http://sinorarechem.com/upload/files/fusaxazelojomir.pdf
    • http://geredekombiservisi.com/userfiles/file/datonav.pdf
    • http://newtarrytowndeli.com/uploads/files/ladofi.pdf
    • http://el-master.ru/userfiles/file/69830860891.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a6b5672af6fc1cd372f79bca1ab5caa1/masuzobavoruluf.pdf
    • http://boston.pl/fck_pliki/file/61096104805.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/49647496469.pdf
    • https://produktybhp.pl/pliki_user/File/mifuvutuwitimite.pdf
    • https://aprenda-atdi.com/uploads/files/nurexipopakepigikanemutug.pdf
    • http://mim2010.ru/userfiles/file/zufudatikonugemiwalu.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_off0000b158.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 16792 bytes
font_01_sfnt_off0000c96f.bin
17229c016dc344185bc0d1dd8a26b235a2cafa600f859edd9a54a93de943b9b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 10632 bytes
font_02_sfnt_off0000e1bf.bin
57fba95e73892a3ea5e4ab96240908d56f67c8b0e47411a8021979146f7f1c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 14656 bytes

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