Malicious PDF — malware analysis report

Static analysis result for SHA-256 8032da304df6a9d9…

MALICIOUS

PDF

38.8 KB Created: 2020-04-13 06:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8bea4709ac109d534127d0ba1406e23 SHA-1: 1a1f6314d2527c795f77677cdd683140f8b4d509 SHA-256: 8032da304df6a9d962e5ac7a9a264e5bda9bc615a09413c1477373b3c686c4ab
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files with numeric or generic slugs, indicating a link farm or SEO manipulation tactic. The document body is minimal and appears to be a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct malicious actions.

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://rightanglerealestate.net/uploads/1/3/0/7/130776308/130776308.html#discurso+de+15+a%C3%B1os+corto
    • http://nylabrands.uk/uploads/1/3/0/4/130476183/sofajupowin-xupalewu.pdf
    • http://cykchefyokkitchen.com/uploads/1/3/1/1/131164239/nejol_kawipasataretaf.pdf
    • http://airborneenvironment.com/uploads/1/3/1/3/131384424/gegax-jabolegexalil-zawemufutosusi.pdf
    • http://rootcausewellness.com/uploads/1/3/1/4/131438234/7499759.pdf
    • http://happypawswigston.com/uploads/1/3/0/4/130435842/gefiseforovanen-vedol.pdf
    • http://arunasmath.com/uploads/1/3/0/6/130603855/78963.pdf
    • http://whiskeywillowdesigns.com/uploads/1/3/0/4/130483629/buteko-jisepa.pdf
    • http://ernergy.net/uploads/1/3/0/5/130546937/3be4b6807.pdf
    • http://lotus-eater-bookonline.ca/uploads/1/3/1/4/131454482/sivuzurotetufej.pdf
    • http://constructorasingapur.com/uploads/1/3/0/4/130483087/6574699.pdf
    • http://sunshinesocialclub.net/uploads/1/3/0/4/130436236/1154813.pdf
    • http://marinecarpentrymalta.com/uploads/1/3/0/6/130604935/6401257.pdf
    • http://infinitespin.com/uploads/1/3/0/8/130813510/c0ae70c8dc.pdf
    • http://allancapital.ca/uploads/1/3/0/2/130289721/5851281.pdf
    • http://southlandsbarns.com/uploads/1/3/0/8/130873828/1475489.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_off00006e08.bin
870874b9d5f3d4cf2424a2f6c37b1a84d9b77b2117211fc75825fda460b0ee7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E08 8812 bytes

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