Malicious PDF — malware analysis report

Static analysis result for SHA-256 3711a1f695e755dd…

MALICIOUS

PDF

57.7 KB Created: 2020-03-26 06:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 347c5290abd43757b61a4503d30a8bf5 SHA-1: faa170bbf31a7779f0be442704f22f8ed123cf60 SHA-256: 3711a1f695e755ddae7bc63c1c7dbf1f19bbaa4d7efe66f06fee83f481d456f4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 External Remote Services T1204 User Execution

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'Circulos de calidad' and references the wkhtmltopdf application, suggesting it may be a lure document. The primary attack pattern involves directing users to a vast network of linked websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://pinktitans.ca/uploads/1/3/0/5/130588529/130588529.html#circulos+de+calidad+caracteristicas+para+el+funcionamiento
    • http://racefkc.com/uploads/1/3/0/3/130313414/fusijitaxizajob.pdf
    • http://securityheadquarters.com/uploads/1/3/0/4/130491179/6c9eaa4b5b.pdf
    • http://firstmam.com/uploads/1/3/0/4/130483552/445ac8c3ea0d6d.pdf
    • http://jasonchengdesign.com/uploads/1/3/0/6/130604319/4e60cf8.pdf
    • http://d0ixvpztpf.imagecode.org/uploads/1/3/0/8/130874430/lugodebisoj.pdf
    • http://awinedesign.com/uploads/1/3/0/9/130969441/luvoludo.pdf
    • http://akashachamberlain.com/uploads/1/3/0/7/130775628/719185.pdf
    • http://transpolyusa.com/uploads/1/3/0/6/130620305/zoboforide.pdf
    • http://atnaservice.net/uploads/1/3/0/6/130604536/levaxagikivezefinu.pdf
    • http://mkpowercycletraining.com/uploads/1/3/1/0/131069750/liretaxi.pdf
    • http://e2lectric.com/uploads/1/3/0/2/130289620/padijufam.pdf
    • http://scaredy.cab/uploads/1/3/0/8/130814248/lorizifes.pdf
    • http://staceyjanedouglas.com/uploads/1/3/0/8/130874237/4200921.pdf
    • http://chicagofinancialsearch.net/uploads/1/3/0/2/130287953/xewawufom.pdf
    • http://empleos.fun/uploads/1/3/0/7/130738764/modijegofij.pdf
    • http://kruthuset.com/uploads/1/3/0/5/130589339/3156728.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_off0000b4bb.bin
8a09c36ea6e35159674797b176836b660a6df36ed024759b5dca62877fc50a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 9432 bytes

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