Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba430c76e6b66371…

MALICIOUS

PDF

85.6 KB Created: 2021-03-03 08:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d9fa1ea2eeaa6d412bae0ed6ed1bacc2 SHA-1: 4ac3635b93e60181e4d295387d0f425f7f27ad3f SHA-256: ba430c76e6b66371753853ae93d838c236cb10b48518aaec18d400176605a878
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely used to host a phishing page or distribute malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to redirect users through a network of disposable domains. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=fourier+cosine+transform+of+e%255E-x+mcq PDF link annotation
    • http://moitender.org/guvamazutapovomawaay9x.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/ifX9G3M/robux_calc_free_download_no_survey.pdfIn PDF document text
    • http://item-get.top/important_days_in_world_historyb7930.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/jjjbI0w/wegad.pdfIn PDF document text
    • http://evromotors.net/sistema_mexicano_de_alimentos_equivalentes_libromwswo.pdfIn PDF document text
    • http://fb-ig-copyright.com/531115889yyvzy.pdfIn PDF document text
    • http://whalesqpa.fun/zolikameca8g.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/the_tempest_sparknotes.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/Qahc7UE/robert_frost_elementary_school_mount_prospect.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/f8hbghm/tank_battle_3d_world_war_ii_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/crypt_of_the_necrodancer_switch_guide.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/apple_mac_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/addiction_2004_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/ascites_due_to_cirrhosis_guidelines.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 5228 bytes
SHA-256: 85d08f7dbd8ba345225202362d403b8f35713d506a9e1d3b97f0b5d87fde6990
font_01_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 12384 bytes
SHA-256: 76ebfd39656213cc13788861f53f34bb6f1d82b3b812f9528c811ac298e49fcd

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