Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a84d883057da36a…

MALICIOUS

PDF

35.6 KB Created: 2020-04-04 10:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 314f0effa9dd7c5f7544fffdccf68af4 SHA-1: 7c700153f35e2bd66bc7ce06a4484e059e126c43 SHA-256: 0a84d883057da36a83e2989d1ca1ec7deaad73f52788fbf01167701f651196c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness. The embedded links likely lead to further stages of an attack, potentially exploiting vulnerabilities or leading to phishing pages.

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://marengineering.net/uploads/1/3/0/8/130813784/130813784.html#nia+210+mapa+conceptual
    • http://benjaminairgunreviews.com/uploads/1/3/0/8/130874034/f4f678b79ee7fe.pdf
    • http://jdarhymes.com/uploads/1/3/0/5/130540824/tupusojevuvobaja.pdf
    • http://sabrinisnatural.com/uploads/1/3/0/2/130270903/d226af390c236e.pdf
    • http://casabiblianense.org/uploads/1/3/0/9/130969420/81a0ecb5486fec.pdf
    • http://lutcherpsychological.com/uploads/1/3/0/5/130551564/7186811.pdf
    • http://bethesda2ministries.com/uploads/1/3/0/3/130312913/6146272.pdf
    • http://tradeoutfitting.com/uploads/1/3/0/9/130969339/befel-jemavatot.pdf
    • http://rightparty.us/uploads/1/3/0/5/130550890/zafejerugesuvi.pdf
    • http://stylesetc.net/uploads/1/3/0/5/130589401/bifovigiwipo-fitumimawetix-moxifawovixe.pdf
    • http://liveboldlysinglesretreat.com/uploads/1/3/0/2/130289355/toxeko.pdf
    • http://finleybroswood.com/uploads/1/3/0/6/130639753/9a1cdae5.pdf
    • http://redhawkfoundation.org/uploads/1/3/0/6/130622029/levefapotumex.pdf
    • http://rockingmfsporthorses.com/uploads/1/3/0/8/130814633/zejinirit.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_off000062ed.bin
881b7232fe95f7a4895aeed39a04321b9e52385da664e92a2b94c5f8169d1194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 7856 bytes

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