Malicious PDF — malware analysis report

Static analysis result for SHA-256 618f92012103d6ee…

MALICIOUS

PDF

70.5 KB Created: 2021-09-13 08:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b461202a02cb409a37006dfbd3c137b SHA-1: 270509f81b1dc6ae0bd04e86b9eacc91eb0422e1 SHA-256: 618f92012103d6eef514770a122eeadf1ec5fbd0d823da550e37ccf66722e4b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=jurassic+park+builder+mod+apk
    • http://putzlappenborner.at/editor_up/viwejotu.pdf
    • http://cabanagarden.hu/editor_up/subixuj.pdf
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/44598017189.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/94268721508.pdf
    • http://net-marketing.hu/images/files/53774268933.pdf
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/7409182539.pdf
    • http://csc0851.com/userfiles/file/20210911031104_1gem6a.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/tevigisimewimiduwebexulu.pdf
    • http://maxbrio.kr/files/files/zakanisuwawamada.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/91605368683.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161339a34990bf---96622056328.pdf
    • http://grupopiscis.com/upload/files/juxusaloxil.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/76840223588.pdf
    • http://letsfinal.com/userfiles/file/bifaturutugosevezi.pdf
    • http://ajeah-intl.org/fck_image/file/mirepasuxo.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/76371376900.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/masijudu.pdf
    • http://agataklimowska.pl/userfiles/file/63076519811.pdf
    • http://wowbond.com/upload/Fckeditor/file/gobavepibusa.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/kaburopujogewi.pdf
    • http://spreewaldatelier.de/img/editor/file/ruwolaxelixixavu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca38e9abe---nimunanerojaxe.pdf
    • https://ratodua.com/contents/files/21158864259.pdf
    • http://frezerovka.by/images/fxeditor/file/65313112360.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_off0000b56f.bin
57c9a32cb3b3e67bb08e88dda18cbfd82017359314f70065f862d57c1e23fe6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 10796 bytes
font_01_sfnt_off0000ce17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 16792 bytes
font_02_sfnt_off0000e629.bin
6f1f246ece5061d4e3ff57bfd619bb1fd078843e1da9a1a351e99ab5d8a52b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 14972 bytes

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