Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba2f1a4011851cc…

MALICIOUS

PDF

74.2 KB Created: 2021-03-25 14:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c861c38d43c0f85bb4f1e05fb2b166ff SHA-1: 901987ae98e1f33d927a2bf4eb57d362b7230a14 SHA-256: 0ba2f1a4011851ccfe2f0907b96bd6715bc804322d46676e37ff42998772a8a6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic flagging it as a phishing attempt. The primary malicious URL, 'https://botokaw.ru/strik?utm_term=how+to+get+sound+to+work+on+acer+monitor', suggests a lure related to technical troubleshooting. The PDF's structure and the presence of many links indicate it functions as a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/strik?utm_term=how+to+get+sound+to+work+on+acer+monitor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405409/normal_605af515215bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_604d8d252ce4e.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/que_es_auditoria_interna_y_externa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368958/normal_600450f593f3e.pdfIn PDF document text
    • http://xuxoromozura.iblogger.org/14693859878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366050/normal_5fde0fafd1363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff8b05712e03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_5fe910a882041.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/aparato_reproductor_masculino_partes_y_funciones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffd1d1c04c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_6036825bafbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601830cd865a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_603a0dea49d43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolirazebaf.myartsonline.com/pojagogubafivajixavosudi.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/ansys_maxwell_free_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/physicians_desk_reference_2017_free_download.pdfIn PDF document text
    • http://mepejolowu.rf.gd/girlfriends_guide_to_divorce_cast_season_3.pdfIn PDF document text
    • http://roduteberilexel.epizy.com/fododexejewuwusatubamadij.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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 5344 bytes
SHA-256: 0613cca7802852f560de80387780aca5406abd0c0b1e2b16c4fa4e26f7c1a168
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10960 bytes
SHA-256: 769d57be89d111b141500c6008c5549dc76ebb5e37848f99e5089ccb8d45b4f8

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