Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7de0b22971d5db…

MALICIOUS

PDF

35.0 KB Created: 2020-05-16 07:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1dd9a06c2d7ec0e065a5be88d2de51b SHA-1: aa90073c73c9ee457a54c631432bfc35ee0b9f8c SHA-256: cf7de0b22971d5dbc0d3061b6f615a975e97251048a31ebbaa9936fb0e67d81f
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the URL http://brahmaathletics.com/uploads/1/3/1/8/131856277/131856277.html#bolivar+ferry+medical+pass+form, which is also present in the list of extracted URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://brahmaathletics.com/uploads/1/3/1/8/131856277/131856277.html#bolivar+ferry+medical+pass+form
    • http://hippostories.org/uploads/1/3/0/8/130873914/cfabe11631576b1.pdf
    • http://coloursbox-sunomono.com/uploads/1/3/0/2/130291474/5417413.pdf
    • http://be-resourceful.com/uploads/1/3/0/5/130588221/298281.pdf
    • http://sdsuprojectsearch.com/uploads/1/3/0/7/130775797/lozofomedesiso_zedese_fewox_liduleleba.pdf
    • http://volunteer4kids.com/uploads/1/3/0/5/130550901/2280198.pdf
    • http://kips-trips.com/uploads/1/3/1/4/131406687/8803258.pdf
    • http://higherselfcounseling.com/uploads/1/3/0/4/130476468/c487300.pdf
    • http://uintasecurity.com/uploads/1/3/1/4/131407695/xifamivivap_gimidizuzojot_robopumonibo_pavaxikujisud.pdf
    • http://dcmusictheatreworkshop.com/uploads/1/3/0/5/130542770/regakeraxuf-rudofitupi.pdf
    • http://seedscure.com/uploads/1/3/0/6/130639565/6131671.pdf
    • http://kaattilley.com/uploads/1/3/0/8/130814393/wefufol-fivososafiz-xojifelijubewaz.pdf
    • http://majkenbdesign.com/uploads/1/3/0/4/130476607/navosazogobiz.pdf
    • http://the-tv-guy.com/uploads/1/3/1/8/131857057/fowopefofidoz_manimozafakox.pdf
    • http://pureromancebyrenee.com/uploads/1/3/0/7/130776747/5067388.pdf
    • http://marshallyoga.com/uploads/1/3/1/6/131636965/mizoba-zopupaja-zitimujive.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_off00005e73.bin
0234d6b20a7ae298ad4e6bbf5514bf8ebf6b12a31219bc903a4465e8c1ce6742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E73 10028 bytes

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