Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff561eea27847df…

MALICIOUS

PDF

82.9 KB Created: 2021-03-21 21:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a4c0e4c53e19d21017d72e643a167a SHA-1: 319ceefcbd6bf4cffbf63224c2b55465c988b13e SHA-256: eff561eea27847dfc6da42bd6eb2ab8bf2f73187a86d8b81c1e20e97cdd6bea8
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to various external websites, one of which is a phishing URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's content, though obfuscated, appears to be a lure related to a search query, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://botokaw.ru/strik?utm_term=what+is+the+best+candle+company
    • https://satuvimafinob.weebly.com/uploads/1/3/0/7/130739393/kawixadunoj.pdf
    • https://cdn-cms.f-static.net/uploads/4382966/normal_603717d64d356.pdf
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/rejutojugususezawure.pdf
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/tebef.pdf
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/87dd6f697.pdf
    • https://dafemiperufukoz.weebly.com/uploads/1/3/1/3/131379503/wegunalari.pdf
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/tetegasur_simogutigax_bedefezag_nininutagokix.pdf
    • https://static.s123-cdn-static.com/uploads/4414491/normal_6008ca14801cc.pdf
    • https://bimifubonag.weebly.com/uploads/1/3/4/8/134881536/kixovajisafew.pdf
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/lezota.pdf
    • https://jabikazisejifo.weebly.com/uploads/1/3/1/6/131606509/xarufajud_tivakavakut_bokufurupaju_zafibe.pdf
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/jumagu.pdf
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/9774963.pdf
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/rotutu.pdf
    • https://cdn-cms.f-static.net/uploads/4448731/normal_6018506be9f09.pdf
    • https://cdn-cms.f-static.net/uploads/4394072/normal_603ec5e97968f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_4d0000e1fd35403395972d42d69e79d1.pdf?index=true
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_e525ad07310f46d0a41bf68de79f9e7e.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_3c0011dc5d9c40eb88c0af4d83b4f027.pdf?index=true
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_7a43e92c796049c3b8889a8043047932.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_ad85a6500f824ce28bb293052de3e12c.pdf?index=true
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_79afa0f85d434a96a685036a8d9af29b.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_a31babd4ebfe4d60846c9caba4eb570e.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_off0001051e.bin
3cb87ce51d30c14b2f6b489bbf129133618cb14dc607e64a246060a6597851a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 5472 bytes
font_01_sfnt_off0001179d.bin
8b18d69a99924c234bfc03ca0a8b278620363a3bd74258d091980cce7e26305f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 11348 bytes

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