Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5fada6e0ff6c6f…

MALICIOUS

PDF

38.8 KB Created: 2020-03-23 13:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 835efbc5042c1b0ee1b87ead8d012c92 SHA-1: d20da03d33cc6dc0f7c276aa6c714302d05a6707 SHA-256: 6c5fada6e0ff6c6fe8d843915eaac96270a5bd94325565b5aaa24574aa57bbf2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially obfuscated, includes the title 'Filosofia y metodo cientifico' and references wkhtmltopdf, suggesting it may be a lure document. The primary goal appears to be directing users to a network of suspicious URLs, likely for SEO spam or to host further malicious content.

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://blushingbrowsstudio.com/uploads/1/3/0/6/130621641/130621641.html#filosofia+y+metodo+cientifico
    • http://radjam.net/uploads/1/3/0/8/130813037/9542352.pdf
    • http://ryoshinakamura.com/uploads/1/3/0/8/130874674/wavomedijiru_tokobunozumu.pdf
    • http://adsl-208-190-128-198.atcoflex.com/uploads/1/3/0/9/130969566/5687195.pdf
    • http://bardswine.com/uploads/1/3/0/7/130739049/4a6872a4.pdf
    • http://humbertoveloso.com/uploads/1/3/0/4/130477663/1987fc2.pdf
    • http://22apothecary.com/uploads/1/3/0/6/130621075/vasape-kotuti-nilibolod.pdf
    • http://mta-sts.mx.bagcharmboutique.com/uploads/1/3/0/8/130814594/rijowekinipozuk.pdf
    • http://mx.wormisgreen.com/uploads/1/3/0/2/130291523/jabige-sejerudazosa.pdf
    • http://smokceshprod.com/uploads/1/3/0/5/130551206/96e7c05ad9ae.pdf
    • http://insureapplewatch.com/uploads/1/3/0/4/130476454/maxuteto_kaxizigolos_vikepud_dijaf.pdf
    • http://jinduyulezaixian.f18.ebkf.org/uploads/1/3/0/4/130483678/8950347.pdf
    • http://miss-diva.com/uploads/1/3/0/7/130775427/nupizugefagij.pdf
    • http://4lawsfamily.com/uploads/1/3/0/5/130543019/2216115.pdf
    • http://www.4goddessraine.me/uploads/1/3/0/4/130489706/9300660.pdf
    • http://dallasanddelilah.com/uploads/1/3/0/6/130621511/7f24a6c4d6f4.pdf
    • http://thedustymuzzel.com/uploads/1/3/0/2/130271042/110567.pdf
    • http://twodowneastdudes.com/uploads/1/3/0/2/130272435/cf43659.pdf
    • http://luetjensocialstudies.com/uploads/1/3/0/5/130551369/4240964.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_off00006c3b.bin
fd0f931a84da404b734164810a6dd6f61f21107d42999d750b31ba3d4102e37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3B 8816 bytes

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