Malicious PDF — malware analysis report

Static analysis result for SHA-256 e501d3d1b1ed3982…

MALICIOUS

PDF

120.7 KB Created: 2021-03-13 13:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8450f5531a8d925eae305fded2cf174 SHA-1: bd765f4e1e61e59f211f2e3bc2947e867fbf4b7d SHA-256: e501d3d1b1ed3982fbee3ef32b6718b622680765d343e9d03bf938331fe2548c
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document's apparent purpose of redirecting users to potentially malicious sites align with spearphishing tactics.

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://lozipotod.ru/award?keyword=ielts+speaking+topics+2020+september+to+december+pdf PDF link annotation
    • http://vash-fasad.live/zimawefick4vb.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/difX0Iu/best_gear_oil_for_drag_racing.pdfIn PDF document text
    • http://nukicew.xyz/how_many_times_do_harry_and_ginny_kiss_in_the_half_blood_prince_moviej454g.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/uy6Evid/definicion_de_psicologia_del_aprendizaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_601eedd000616.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5ffe8c2ac8f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_602b72b13db36.pdfIn PDF document text
    • http://matras-24.ru/tidesadijifaxexujal93rn.pdfIn PDF document text
    • http://korsabarca.com/jansons_history_of_art_7th_ed6y1wa.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/eGggjib/fapikaxukudekexurukezifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_600e568e2a941.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_0e4dcdf8672c4bb39151d347692bf8d9.pdf?index=trueIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_586a9cc90a124d2c9e39b746a8670dc0.pdf?index=trueIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_3bf4f6c1014b46f7885db6e4d8531ad3.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_e30e6e986df34a79b795687f296d321f.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_8c83c2c83ef14ff6af740ec374a090e9.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_85f8643ba2614f3692bfd97addf9a63b.pdf?index=trueIn 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_off0001963c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1963C 5892 bytes
SHA-256: bc915fa045a256b28d1ab1e256548a3908c482beb93d61b15b8f56a1f037c04e
font_01_sfnt_off0001aa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA31 12060 bytes
SHA-256: 399ade8c1aa64e58f97f7c4865aff2dd050c3f101d484e1437d5cdfa360c7d0c

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