Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff68244ee9ddf7ac…

MALICIOUS

PDF

75.9 KB Created: 2021-02-26 19:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2aa9a5408c9ee3a9fa48ba360c1cd24f SHA-1: 526b1b7a832adea0f35bb2676564d1b1b0d2018f SHA-256: ff68244ee9ddf7acb3be0829c0fe5b1adf664b1f4ff3c76ce2ff51753077535d
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm hosted on disposable domains, designed to appear as a Microsoft Office 365 tutorial. The primary malicious URL identified is https://zajinet.ru/award?keyword=microsoft+office+365+tutorials+free, which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://zajinet.ru/award?keyword=microsoft+office+365+tutorials+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413458/normal_6024391767aa5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_5fc819ab70ef6.pdfIn PDF document text
    • http://prizinsta24.space/achievement_motivationr3uep.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/what_can_you_do_with_a_computer_networking_degree.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/suluse.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/gosawevulinakuxoriso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5fe181d3055cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5fe279b067466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_6011b77490b88.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/hijajdi/katamotarefinabeweniz.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hd7UIgg/shelter_insurance_claims_jonesboro_ar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://labukifured.epizy.com/gotthard_tunnel_fire_report.pdfIn PDF document text
    • http://pasalalu.rf.gd/45196291490.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/78910872023.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/jikafopejedilig.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5320 bytes
SHA-256: ba324e278a8484d167ebdc07a05b87500a15f7c1009e6b29c840d46fc00dad95
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 10660 bytes
SHA-256: db328ee520a469dfbcbd4a0b9731ca1e4cf868be4d224286d106aea9a080f71d

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