Malicious PDF — malware analysis report

Static analysis result for SHA-256 b155e3433dbb0651…

MALICIOUS

PDF

69.9 KB Created: 2021-03-17 04:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db866b5728dbe0402273595b835cebfe SHA-1: 2221e2134049c1cb084c859fb0115f328772f931 SHA-256: b155e3433dbb065143dd5d6f91e82a7296a7a1b8955a487bfdd19eaf6ad61c67
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on various domains, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=free+red+black+wallpaper
    • http://atomyimperial.ru/70323231435emtdz.pdf
    • http://frontglass.xyz/14367168494sln4p.pdf
    • https://jixofivibup.weebly.com/uploads/1/3/4/6/134682426/zaniraparobor_lotibiju_pidebikati.pdf
    • http://idealslimitalia-oficial.site/how_to_pair_clarion_cz315e_bluetoothpiocb.pdf
    • http://trastqort.online/xupabubuzozizaypep6.pdf
    • http://file-id.ru/kigadalifabejekugoxyu05p.pdf
    • http://aduo5.online/83521115284dsf74.pdf
    • http://rabiwitijif.medianewsonline.com/abdomen_anatomy_questions.pdf
    • http://dorightunion.com/air_traffic_controller_online_programspx022.pdf
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/92bb0ed1d5c8499.pdf
    • http://gadetebes.sportsontheweb.net/el_coronel_no_tiene_quien_le_escriba_personajes_secundarios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_9fa33718579d46cca3fd51c4bc6e547f.pdf?index=true
    • https://s3.amazonaws.com/tipikaxe/hp_8620_printhead_part_number.pdf
    • https://s3.amazonaws.com/resixexi/42683522861.pdf
    • https://s3.amazonaws.com/gosete/spotify_desktop_quality.pdf
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_ab67060c811447a2bb68155983d73b07.pdf?index=true
    • https://s3.amazonaws.com/latufenaw/43937616705.pdf
    • https://s3.amazonaws.com/vuliwisuwig/ser_bachiller_2016.pdf
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_2bddd659c5204f6e946cef23c53be3f1.pdf?index=true
    • 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_off0000d5b9.bin
2158e06b68e4e64ea77437f1a07b03ed49a0b8bb63e5fc34db1ce3450f7dee0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 5140 bytes
font_01_sfnt_off0000e757.bin
342e28e6e359054a2194bcf7ab33eca10b0d9457650f67c2595654414aebf236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10336 bytes

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