Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b358e527dbbccd…

MALICIOUS

PDF

43.5 KB Created: 2020-04-02 09:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ba0b164684abd82911989eb2a5dee08b SHA-1: cf183456213e54ddca6cb45fa5e274e2ca8ae872 SHA-256: 58b358e527dbbccdbcbee51d6424be361f8337ffc90a4bbdf68eab87b3f6c6d4
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to distribute or obscure malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains Spanish text referencing 'Trojan horse 1 in PDF' and mentions wkhtmltopdf, indicating a potential lure or obfuscation technique.

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://chewoncakes.com/uploads/1/3/0/6/130639636/130639636.html#caballo+de+troya+1+en+pdf
    • http://episcopalgenesis.com/uploads/1/3/0/2/130271041/sapubexepugimi.pdf
    • http://taylorheersphotos.com/uploads/1/3/0/5/130544009/7043552.pdf
    • http://calijyl.com/uploads/1/3/0/7/130775011/4329e.pdf
    • http://sciencechicks.com/uploads/1/3/0/8/130874143/1792aa.pdf
    • http://gozelda.net/uploads/1/3/0/6/130605073/b43eef.pdf
    • http://crudorsey.com/uploads/1/3/1/0/131070375/tezekixawitugodofa.pdf
    • http://clmartin.info/uploads/1/3/0/6/130620794/e3f486e4.pdf
    • http://f1helmetcollector.com/uploads/1/3/0/6/130620565/jijekedexibab.pdf
    • http://heartsoulrelations.com/uploads/1/3/1/4/131452989/vomaxapulozo-buvutuvazesok-gekar.pdf
    • http://aktivtrom.no/uploads/1/3/0/8/130874394/sezajemesetapez_vivesaferera_wavadarev.pdf
    • http://prfitness.net/uploads/1/3/0/9/130969226/lumakofetelijelu.pdf
    • http://naaboard.com/uploads/1/3/0/6/130622111/xorotuj.pdf
    • http://markweeksblog.com/uploads/1/3/0/7/130776783/xatowopi-titenog.pdf
    • http://unftelecom.org/uploads/1/3/0/5/130589150/rejemasiwibitasaki.pdf
    • http://browsmithmbc.com/uploads/1/3/0/5/130588685/6141842.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000694e.bin
6fc352a5a76e867af74273645ce084e9e6237cbf17a23252fda7eceac444d750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694E 9072 bytes
font_01_sfnt_off00008a5d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5D 16036 bytes

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