Malicious PDF — malware analysis report

Static analysis result for SHA-256 369ce6383563e151…

MALICIOUS

PDF

67.3 KB Created: 2021-02-16 12:59:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3c23cc638345a1185dad75670d0855dc SHA-1: 552a50e0e3a550145cabc9cf8d40e4b0fdbaa9e7 SHA-256: 369ce6383563e151e6b81b1c705690b1d3cd6987d911222facf287ed51b2969c
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://bologen.ru/strik?utm_term=writing+tools+50+essential+strategies+for+every+writer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373779/normal_6019d1d3e2134.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/550a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fe8bfe8bc2a3.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/1065342.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/podijikomed-tibekar-lazupin-vetazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_600d6d1ca3dc4.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/nejagawe.pdfIn PDF document text
    • http://lezepubaj.iblogger.org/real_madrid_clean_sheets_this_season.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_6028241beb9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5ff1eb2fb1872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/tilipovukivolokivosere.pdfIn PDF document text
    • http://wubonaxe.epizy.com/kazakhstan_tourist_guide.pdfIn PDF document text
    • http://muwiliwus.epizy.com/musabodanaxawuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 5528 bytes
SHA-256: 7083b1f6bc3dbf10c7b1ab088c40204496e814b393e4a252458c7a1c803b439a
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 9768 bytes
SHA-256: a10c98994229dfd9b7d840905ce7b7a3a884b2b0cc1a7757e573802e016f7e34
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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