Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2d6160b0461904…

MALICIOUS

PDF

74.7 KB Created: 2021-02-18 21:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6a90059bb375ff6371d2180c4eb85095 SHA-1: 7487c7206f29f8a9653e4718c54f7f77dd01526e SHA-256: cb2d6160b046190462ba77bf4f23da82c4e1ca934e7eaf069c1cec6efcddaf15
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/123?utm_term=what+do+pink+rose+symbolize PDF link annotation
    • https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/kopefade.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/e0a1c8d354cb8f2.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/ghVjhCo/jozokumapumolozunup.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/zwjduhb/3909279758.pdfIn PDF document text
    • http://hookup673.site/70646668662ocikg.pdfIn PDF document text
    • https://debarinibew.weebly.com/uploads/1/3/0/7/130775297/tinezuvalutag-rofed-wibese-keviv.pdfIn PDF document text
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/nufugixizexo.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/1icIdgh/ketafetebudinoloji.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/ijNK4je/zombs_io_battle_royale_poki.pdfIn PDF document text
    • https://xanojamazifedim.weebly.com/uploads/1/3/5/3/135323589/lapixokel-ruwoto.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/gdhbf6N/21651172905.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/jibitigu.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/qnhbjgn/84704846461.pdfIn PDF document text
    • https://finiluxib.weebly.com/uploads/1/3/5/3/135350298/6822869.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/jizbmlY/arknights_operators_list.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/najipavez/ronodotupebim.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/33525505394.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/locker_group_perforated_metal_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/6683240766.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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 5568 bytes
SHA-256: 57f0b0ecd2865b20b9daae1bc9bdee99e30387eb61b0bb0f120c47056958d16d
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10960 bytes
SHA-256: 4853d60308717b169e6213fe82a51bddc2aea7e768606c111066363234e03dde

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