Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a49e4ef568f2a0a…

MALICIOUS

PDF

36.2 KB Created: 2020-04-10 03:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ba3a9a02203f064fea9741f6d9a38bb9 SHA-1: bc1a48a8bd0236a1ffd8515f604e434007a1a39e SHA-256: 3a49e4ef568f2a0ae9a47b96987c9c820951ac5f3b5d054b3e17299d15a807b5
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various PDF files hosted on different domains, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive link farm is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://ebmccallanbuildingltd.com/uploads/1/3/1/1/131163690/131163690.html#vestimenta+de+los+lacandones
    • http://isfnrconf.org/uploads/1/3/1/0/131071288/aa39b614.pdf
    • http://nudash.us/uploads/1/3/0/4/130435875/pudekunimijaxap-xesanemut-noriwuwif-tofepowew.pdf
    • http://tissuetales.net/uploads/1/3/0/6/130604486/xumijuvasanivosusefi.pdf
    • http://paramountpoolservicesco.com/uploads/1/3/0/5/130547924/nosotegis-vubipu-kuxixukavuzigip-jobudowemejibe.pdf
    • http://sandersvhs.com/uploads/1/3/0/6/130621587/1708734.pdf
    • http://mmc-edd.com/uploads/1/3/1/4/131406780/7ebb7f28f.pdf
    • http://thisowned.com/uploads/1/3/0/6/130603835/9869799.pdf
    • http://ikonempire.com/uploads/1/3/0/6/130620940/supebekoge_molujugobilu.pdf
    • http://beesquarebodycare.com/uploads/1/3/0/2/130271177/14c648.pdf
    • http://mimismunchiesco.com/uploads/1/3/1/4/131483009/8989150.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_off000065f8.bin
139ff3204e0b3bfd960d817ea0d2ebc157ee7f95b7715d1399dae302b3748eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F8 7784 bytes

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