Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c4f1f867366466…

MALICIOUS

PDF

67.9 KB Created: 2020-04-13 05:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ce0afb95ae31783f617ba1f4923ac95 SHA-1: a21558d904cd0872bdaf68945eeec1b2526760ff SHA-256: 87c4f1f867366466920b7235a72284942bcaeed708ab74ba40248b76d1348350
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the numerous external links suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lightwavecommercial.com/uploads/1/3/0/4/130436298/130436298.html#tod+in+venedig+kapitel+4+interpretation
    • http://threemileapparel.net/uploads/1/3/1/4/131454120/ligalifapunamax.pdf
    • http://kangedefa.com/uploads/1/3/0/6/130620747/b80cf2a1.pdf
    • http://emeraldveiling.com/uploads/1/3/0/2/130291433/dekomugu-mimenipere.pdf
    • http://homelessprevention.ca/uploads/1/3/0/4/130483656/lexosipa-kabunis-relozewidaru-zetavijovujuf.pdf
    • http://ludwigcluyseart.com/uploads/1/3/0/6/130639533/megegobajipuwi-sobiku.pdf
    • http://mcagnz.org/uploads/1/3/0/8/130815351/7721988.pdf
    • http://prsales.org/uploads/1/3/0/8/130874258/1e458.pdf
    • http://dreadsonlocatlanta.com/uploads/1/3/0/4/130488301/tipodoxokometu.pdf
    • http://intransitlimited.com/uploads/1/3/1/4/131453969/b9c3799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d3.bin
35ad502d84e3264e1b79f0d5b5ab162f491bf3bcee5f12b6e25d413b5170140b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 9968 bytes
font_01_sfnt_off0000f834.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 2652 bytes

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