Malicious PDF — malware analysis report

Static analysis result for SHA-256 681a59ffb2c0498d…

MALICIOUS

PDF

76.6 KB Created: 2021-04-24 23:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a3eaa83df99b481d4e72ea3b8fc02ec6 SHA-1: 26a1034eb0107c2400547c8527057e31c65914bb SHA-256: 681a59ffb2c0498d9ba73ab07405d49276f6813ae62c28219155e96c7fadfca8
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to car seat installation, directing users to a malicious URL. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=how+to+install+forward+facing+safety+first+car+seat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fcefd03b4848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_603a5f85b52e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464863/normal_5fd8fd1635276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5fe31c8172839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_605a7fcc6a0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_605f9eff4ae6b.pdfIn PDF document text
    • http://lobutojumakix.22web.org/53228643020.pdfIn PDF document text
    • http://ruguxod.iblogger.org/40172757975.pdfIn PDF document text
    • http://teligelufinuv.iblogger.org/16691449152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_60470160ba54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6050db5b3e9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_605c933015371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_603f559595cfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamutazuzores.epizy.com/citroen_xsara_picasso_manual_service.pdfIn PDF document text
    • http://pijiwir.rf.gd/caste_certificate_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe22c0a-ec9a-4ae9-a1ea-8a56e15f0e8e/alla_prima_painting_meaning.pdfIn PDF document text
    • http://zaxisomal.epizy.com/pemeriksaan_apusan_darah_tepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df311459-b06d-470c-83ff-500f767f32b1/power_of_thoughts_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d0b07c-7df3-4dd5-ade1-7bf1f2f7ffe5/ikea_catalog_2020_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0205564-c2ae-4316-879c-c872863d66a3/safatisowex.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5344 bytes
SHA-256: e951329b5d7d5b227ec974ab77255f67c7d4875ea501c123310ae108065ddf4c
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11020 bytes
SHA-256: f7e818a1c183978fc191231c27e3d9cd15507971a2e2f545437f3a728213348f

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