Malicious PDF — malware analysis report

Static analysis result for SHA-256 a403d26c3b8ba92a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 06:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdf723d6969b98d2ed20f91b71d2ac8a SHA-1: b15c3f1b8065abaa1cea2a98136ad9a1cde2fc7a SHA-256: a403d26c3b8ba92aaac4a8b993fba85502241d778aa2bbbe8d15a856807e15d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which are part of a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution, disguised as a lure for game mods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=download+gta+5+san+andreas+mod+apk
    • http://fygl.net/uploads/file/190933536159.pdf
    • http://viorina-deko.com/images/file/40665883213.pdf
    • http://deaprogettazioni.it/userfiles/files/56296271301.pdf
    • https://sikahaiphong.com/images/news/files/51288378091.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/gatoj.pdf
    • http://aadcnfgl.netsociality.com/upload/files/jokidusipepakoremalanuli.pdf
    • http://jamxmpharmatech.com/upload/files/vegir.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7ak1i9fenqnsjgfi60kecf2m08/limigenuwulilogefox.pdf
    • http://sunnysolutions.it/uploads/assets/file/kaxapelagixomiwokamuxoje.pdf
    • http://lorichphoto.com/pictures/file/boxamiwakarixika.pdf
    • http://royalleasingny.com/admin/images/file/napipusetowegudarir.pdf
    • http://iucecb.com/files/file/585181126.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148849d42ed1---duradovopu.pdf
    • https://jcmimoveis.com/userfiles/file/10093783427.pdf
    • http://beveragesgs.com/userfiles/file/vumanebarepara.pdf
    • http://dragonspond.com/uploads/files/koteseva.pdf
    • http://mirsistem.com/depo/sayfaresim/file/60710901978.pdf
    • https://hockeymro.ca/docs/file/14835321196.pdf
    • https://ckmusicdesign.nl/userfiles/file/99033967402.pdf
    • http://oishisushigd.com/uploads/files/95895459770.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/21765555877.pdf
    • http://secretinvitation.net/images/files/sizaxeb.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_off0000de3e.bin
acd70b5a14dbaa655c4fff92406055ca751d5f35374f8ab03b0fabb041b85f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 10956 bytes
font_01_sfnt_off0000f79a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 16792 bytes
font_02_sfnt_off00010fac.bin
a2d20bcc47c62e45d053857272f87d0214dcc9b710aadedfb74f8e1f92abc201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 19012 bytes

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