Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ff4ac22c9a1a4c…

MALICIOUS

PDF

73.2 KB Created: 2021-04-03 03:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bef78db4ff0defa748588fcfee7eca89 SHA-1: eefe423bbdd0fcf2200bbfcc0ad199af8c17dc01 SHA-256: 40ff4ac22c9a1a4c7fa1c56d3e83ecf11b0d3821b2f542788c8745bea8ec69e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=what+does+the+term+man+of+the+house+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404512/normal_5fcb3c706b9d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_5fec8557b5951.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/hhOja7a/pivejegezogezowefadumuvuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_6067a3852e506.pdfIn PDF document text
    • https://cdn.sqhk.co/raxulaxesob/NP1jggc/50765506849.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/hjjjXg6/36750372558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_eeb302d83dc54551be50a69eef476a0b.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_10029eb54874487385f9dde884cef091.pdf?index=trueIn PDF document text
    • http://fifomivosa.rf.gd/philips_aquatouch_s5070_manual.pdfIn PDF document text
    • http://pixutuvaw.rf.gd/97616678091.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_952673fd6f4642bba856d7aa7c41417b.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_6bf1059bcd6a40f2b5a52dbc866b1788.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_6f784b7e42d84132a0dca5dffed049d7.pdf?index=trueIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_406c141d8efa455bb0bf60e6d10f854b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/what_games_to_play_with_your_girlfriend_online.pdfIn PDF document text
    • http://teruwizirazi.rf.gd/83310190691.pdfIn PDF document text
    • http://rovosaba.rf.gd/43990826954.pdfIn PDF document text
    • http://zunebodiz.epizy.com/1670419040.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/15121244391.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_9c4326b7042b4e44bdd8193beb54e573.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 5128 bytes
SHA-256: fcc11cc819e6258a08405ae01b21fafe555a505179280b7b3bf0b6b5f7a2a229
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 10296 bytes
SHA-256: 13ee98a4ed378d49f6a9be6828404c19f114cca261b4abc3f0e6b8b734eea81c

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