Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b416e98edb9925c…

MALICIOUS

PDF

91.0 KB Created: 2021-05-26 14:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e91bf6a8cf158fa538eb56e909dcfe5 SHA-1: 2e7eeafb0c565446e03247568b0a2d7bd349af83 SHA-256: 2b416e98edb9925c64328c0e8665ba759259082fc7112841eea26f005f9b3494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links to external websites, many of which are likely part of a link farm or phishing scheme, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=nice+guidelines+diabetes+algorithm'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=nice+guidelines+diabetes+algorithm
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/pejazevebibil.pdf
    • https://ridulajevu.weebly.com/uploads/1/3/4/3/134352946/daxoxexone_tojupowugiri_wulep_mijeketojer.pdf
    • https://wopuxikejixup.weebly.com/uploads/1/3/1/8/131856699/gapajo_jozasukuder.pdf
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/351696.pdf
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/7e6ebfad.pdf
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/rasogel-relotelemofe-vokobiw.pdf
    • https://dowozazufexu.weebly.com/uploads/1/3/4/6/134606261/8054658.pdf
    • https://gorixiboxizamo.weebly.com/uploads/1/3/4/5/134589430/gusifamezobuwub_taferojaxopone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d52ea50-633b-4008-9f3e-c75583af9366/83193981273.pdf
    • https://uploads.strikinglycdn.com/files/48246bc2-8300-45d7-867c-fa31c252ef79/zamawotakelumatajanizijo.pdf
    • https://uploads.strikinglycdn.com/files/ec51018f-d438-45e5-8fb7-8eb05ade26f5/simuzegeluzutixu.pdf
    • https://uploads.strikinglycdn.com/files/1cb377b9-aab8-4745-90bb-effbbd166909/adobe_after_effects_cc_2018_trke_yama_indir.pdf
    • https://uploads.strikinglycdn.com/files/ee94c29f-5bb7-46a2-8493-c4ce9652c6bf/nagagudimatigi.pdf
    • https://uploads.strikinglycdn.com/files/fcc2e1fd-f18e-4f46-aab7-1bd211985596/4023062206.pdf
    • https://uploads.strikinglycdn.com/files/e79996a2-b601-4301-98b7-95840e1b8845/matlab_legend_position_options.pdf
    • https://uploads.strikinglycdn.com/files/4f94cb80-67b1-4d11-bb38-6b5cd8f42f4b/96968480762.pdf
    • https://uploads.strikinglycdn.com/files/83dad5f8-8595-45b2-8427-403919a2836d/is_shatter_me_a_movie.pdf
    • https://uploads.strikinglycdn.com/files/dc93a2d7-5652-4d0e-a6fb-073fe45d0220/bofosigakutuboverevene.pdf
    • https://uploads.strikinglycdn.com/files/c9f492c1-02ce-482c-bb78-8773bbd39c02/netgear_n600_modem_router_reset.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012704.bin
c9f452d835d1d294f2c01c76105ad15d1a099d246764304101c2752d34f52227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 5464 bytes
font_01_sfnt_off0001396d.bin
bca45c663e33765afb1417e448cd3950282482daf66857469614a0623b88a333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 11036 bytes

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