Malicious PDF — malware analysis report

Static analysis result for SHA-256 2739aeabb60fccb8…

MALICIOUS

PDF

44.4 KB Created: 2020-04-06 10:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f70bfd20e5bac7c269f2ff7ebd99a89 SHA-1: 536781406642c52424e2782b6fe292c60d2f64b9 SHA-256: 2739aeabb60fccb8303712393a7052008d57001258adf9b82d16c142b55a2c44
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be a link farm designed to manipulate search engine results or to distribute potentially malicious content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://navice.org/uploads/1/3/0/9/130969790/130969790.html#liberalismo+economico+concepto+y+caracteristicas+principales
    • http://lesartisanstraiteur.com/uploads/1/3/1/4/131438289/melimo-fabal-waxotexulux.pdf
    • http://hobbyinspirasjon.no/uploads/1/3/0/4/130436054/biturexemufo.pdf
    • http://emergencydisasterprep.com/uploads/1/3/0/6/130621657/bubalifokefudij.pdf
    • http://information-interface.com/uploads/1/3/0/3/130312920/gixadilunem.pdf
    • http://hemlytoolct.com/uploads/1/3/0/5/130542965/ed691.pdf
    • http://maleskincareblog.com/uploads/1/3/0/8/130874627/101734.pdf
    • http://thequay.ca/uploads/1/3/0/5/130588288/nakowofamo-pevupuzus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081b4.bin
deb9168db5b2d155d4ef77cfdc3f88b7025b09a29d4b305cffe423846d087d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 9288 bytes

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