Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9e90fb2ae89fe1…

MALICIOUS

PDF

75.4 KB Created: 2021-02-09 09:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b5796275b9d20eea8ad9c9e65d5532ed SHA-1: c81c146e7b1cfb81cf75907bb5b42e5aa38c008b SHA-256: ab9e90fb2ae89fe15cfccc311ac8e6fb34ef9611a48f20014a3d5c95ecd3d38e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious or unwanted content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://seumenha.ru/123?utm_term=cvs+ear+wax+removal+kit+reviews PDF link annotation
    • http://gouliwer.online/birthday_cake_image_with_name_and_photo_editzxq8w.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/f53e6c69626.pdfIn PDF document text
    • https://dofusugizubev.weebly.com/uploads/1/3/4/1/134108946/bagugesusojuvibevid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600f593b7a338.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/8810201.pdfIn PDF document text
    • http://roskycnmx.com/kobusakeseduwatudarepupk.pdfIn PDF document text
    • http://kenufapozij.22web.org/without_you_charlie_wilson.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/fijuwimagotifaxorepe.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/9532348.pdfIn PDF document text
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/4148746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/56682735926.pdfIn PDF document text
    • http://vodupuginotipir.rf.gd/duplicate_formatting_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/jaynes_2003_probability_theory.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/costing_sheet_tcode_in_sap.pdfIn PDF document text
    • http://tunowik.epizy.com/careem_app_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/39847717253.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5020 bytes
SHA-256: f43c158f617fdcc7e1b1e9a773c810a8a7703d94f438080ce54ec2b0e93965d9
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 10596 bytes
SHA-256: 0338dda6a510f63032d7b9ef45f91295286457325c838f2db1ceac263fc4f789

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