Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e37964ef21ff27…

MALICIOUS

PDF

37.8 KB Created: 2020-03-09 04:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 81f757cdb7bae34c10b4a5d92426176b SHA-1: b19b67e6c6370dc9b0222d3d0032bdbf1efe25d7 SHA-256: 73e37964ef21ff2714c0959fd46332c3fa5b169dbd2497d9ef42c8436f1d5a82
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many with numeric slugs, indicative of a link farm designed to attract traffic or distribute malicious content. The document body, though partially corrupted, mentions "how to combine multiple pdf files into one pdf file online", a common lure for SEO spam and potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://ufe2li.bdgct.com/uploads/1/3/0/6/130605279/130605279.html#how+to+combine+multiple+pdf+files+into+one+pdf+file+online
    • http://vegandoctor.org/uploads/1/3/0/7/130739233/1218097.pdf
    • http://daikanyamaimports.com/uploads/1/3/0/5/130539734/9915871.pdf
    • http://insciteillinois.org/uploads/1/3/0/3/130323298/fubizeke.pdf
    • http://24baltimore.com/uploads/1/3/0/3/130313002/73ab43.pdf
    • http://rosshousemuseum.ca/uploads/1/3/0/6/130620757/0b76ecb74fca4bb.pdf
    • http://sophianesamoney.com/uploads/1/3/0/2/130289765/5397411.pdf
    • http://optoutlaw.com/uploads/1/3/0/2/130272350/7181354.pdf
    • http://mybloomyoga.com/uploads/1/3/0/7/130739379/noxeribotefi_fowutilaj_rozutazatener.pdf
    • http://www.nestandpebble.com/uploads/1/3/0/8/130874403/7112911.pdf
    • http://afrikproject.org/uploads/1/3/0/7/130739525/beedaf7d.pdf
    • http://dollyme.co.uk/uploads/1/3/0/8/130813765/5682662.pdf
    • http://www.sdwoundedwarriortennis.com/uploads/1/3/0/5/130588686/bodekezedu-wozawe-rujiw.pdf
    • http://malouky.com/uploads/1/3/0/2/130271184/9460452.pdf
    • http://www.dpprecision.co/uploads/1/3/0/7/130739996/ragesegadis_xemovosala_radelepom.pdf
    • http://livingstonlimobusandtaxi.com/uploads/1/3/0/8/130814195/kilutinarezuzu_nugorapuj_magirumabiluxe.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_off00006bd3.bin
51ad0e34d26549878e22c20dde5272302191290991f9ab9f3b456a4ec0ce03d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD3 7652 bytes

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