Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ebfb4b585b8872…

MALICIOUS

PDF

74.1 KB Created: 2021-06-06 21:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d1d47cec9d3c3b62cd4820a5624b2c71 SHA-1: ba13348224984ca31d825f2ac96ee2f8c020f422 SHA-256: 51ebfb4b585b8872e1889dbcdfe79f706cb1ca3f06cc0a00788f9e4594694cda
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting a phishing lure. The document body, though heavily obfuscated, appears to be a deceptive search result related to driver's licenses, designed to trick users into clicking the malicious link.

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://allytemp.ru/wb?keyword=what%20does%20an%20ab%2060%20driver PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414172/normal_602ee13341867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_601c67d1239bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5ffaa10b2a6fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_6017bf4433b21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_602ee97d80dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_605cde2428f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_603cacc28c37d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375086/normal_601be21772eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6053bb67e5324.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5ffabecb3b7e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_606e40649b3b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5febee48681e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144573966/how_to_pair_remote_to_roku_ultra.pdfIn PDF document text
    • http://kemulosomul.pbworks.com/w/file/fetch/144654774/61755797661.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144495819/casos_practicos_sobre_toma_de_decisiones_empresariales.pdfIn PDF document text
    • http://fezosubi.pbworks.com/w/file/fetch/144702768/46586541935.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144418941/why_does_it_smell_like_maple_syrup.pdfIn PDF document text
    • http://gifavipa.pbworks.com/w/file/fetch/144611193/how_to_use_the_texas_instruments_ti-30x_iis.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/f/fisogekazetoxutuka.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416733/what_are_the_two_main_theories_of_language_acquisition.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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 5632 bytes
SHA-256: 99e324d9a846ee39a9f0d031dfdd8031740c70ff8fe510de9c188e92153f9834
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 10188 bytes
SHA-256: 49a4368e724bdeeb5be531ede481c1192ee35b2fef2ebcd21ff7385d388feca7

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