Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d52c9fc3bf7042…

MALICIOUS

PDF

45.0 KB Created: 2020-06-05 02:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5b20fdbea44c3e50da3d90f3009bf6 SHA-1: 0ba6e398793b854d2bd9427eb4dba65e0771d020 SHA-256: d3d52c9fc3bf70421003d61aa518f01cc18dcfb26c037438552f11d57185e433
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which follow a similar structure suggesting a link farm. The ML classifier strongly indicated maliciousness. The primary purpose appears to be directing users to a network of potentially compromised or malicious websites, as evidenced by the PDF_SEO_LINK_FARM heuristic and the numerous embedded URLs.

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://muellerwood.works/uploads/1/3/1/1/131164211/131164211.html#aniflv+naruto+chipuden
    • http://bassettfurnituresuperstore.com/uploads/1/3/0/6/130639397/nagolovupufazetizo.pdf
    • http://herohome.biz/uploads/1/3/0/6/130620228/bikurugopusun.pdf
    • http://petejbilling.com/uploads/1/3/0/8/130814749/d1e791528afc44.pdf
    • http://facultyretreat.org/uploads/1/3/1/4/131438610/sumuvejezoto-tedosa.pdf
    • http://cartersconsulting.com/uploads/1/3/1/6/131636777/zinanuri-sesijekixubi.pdf
    • http://aaplex.com/uploads/1/3/0/7/130775434/duwuzifabofob_gejapuliwa_taruwulugajelo.pdf
    • http://chairrecovery.com/uploads/1/3/0/8/130813063/2252775.pdf
    • http://winonabowl.net/uploads/1/3/1/4/131437980/1655916.pdf
    • http://muellerwood.works/uploads/1/3/1/1/131164211/terms.html
    • http://muellerwood.works/uploads/1/3/1/1/131164211/dmca.html
    • http://muellerwood.works/uploads/1/3/1/1/131164211/policy.html
    • https://kegitefivoxu.files.wordpress.com/2020/06/zozaja.pdf
    • https://sigutobe.files.wordpress.com/2020/06/xerigurokudufaxakeleb.pdf
    • https://tejunif.files.wordpress.com/2020/06/405031621.pdf
    • https://jenurozogu.files.wordpress.com/2020/06/84239063715.pdf
    • https://pemaguw.files.wordpress.com/2020/06/25820974606.pdf
    • https://wuniliruk.files.wordpress.com/2020/06/fedutirid.pdf
    • https://nojowijede.files.wordpress.com/2020/06/nixaxalapivadoz.pdf
    • https://xidedikef.files.wordpress.com/2020/06/molipimewaloduwokotuno.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/
    • https://tejunif.files.wordpress.com/2020/06/4

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074db.bin
febf5ef3018cecf2aa0c4a853a3a2e804b263a9beaef45ef8b990ccbb2a99ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 22132 bytes

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