Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf0cf97d281214c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 18:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e30b4c508c8d21c56075da4ceaf6a5be SHA-1: 2fd16bc5194bbcca8dc368c72ba5ffe1d5c3256d SHA-256: cbf0cf97d281214c3176188849803ce7faf4e478d9d73cd78fd3a24fdec24db6
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=free+food+dragon+city PDF link annotation
    • http://ryyw.com/upload/files/2021/09/202109070945156694.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/3905654982.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42115849014.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/84734800533.pdfIn PDF document text
    • http://dmkert.hu/files/file/befupu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/komevasinewomuveku.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/93500073910.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/metalaxekifib.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210903200154.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/dajim.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/1257117264.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/38650576570.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/2824239061.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/peridenafosonur.pdfIn PDF document text
    • http://schokofontaene.de/idata/50190100620.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bijirimefusifaxe.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jojigupuzofulokud.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613514cf6c3ad---20765522477.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/guguxebot.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320f9010368---bolinir.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wozefuwupofitiji.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/6752786744.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 18588 bytes
SHA-256: ed51feb3a16b63b36e988d584e6d2238cdbc15faa9d4bab380f55a5926d5004e
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203D 10528 bytes
SHA-256: ef79cf956e0f74d6a0bc696799c1fb878db934d22d12df928c230fbd47ef32dc

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