Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ca799f83c93095…

MALICIOUS

PDF

33.7 KB Created: 2020-05-30 18:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c7b0e9f668a5bfebb985bb43bd60193 SHA-1: 8de406fa3bc6cee5ae6eb24702a004c0acd089e2 SHA-256: 30ca799f83c930955667c189db89d5062a5afa1c1ac1259c81ce28e56dae0e37
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or distribution network. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xl5616.eliteedu.org/uploads/1/3/1/3/131379014/131379014.html#cathy+duffy+grammar
    • http://jacksieckhaus.com/uploads/1/3/0/6/130604126/kavanajag_xomexeviwi_wadige.pdf
    • http://bubblyfun.com/uploads/1/3/0/4/130483799/nenet.pdf
    • http://citybridalhairandmakeup.com/uploads/1/3/0/6/130621648/nolugopifenibepoxon.pdf
    • http://wineandwellies.org/uploads/1/3/0/6/130621511/d5e39.pdf
    • http://ilonakidsfun.com/uploads/1/3/0/5/130551864/7762715.pdf
    • http://rakkan4x4.com/uploads/1/3/0/7/130776183/9d04e.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_off00005932.bin
3cb015d113f269b19679ed1094dc567984834bfd5647c8e3eeb058b227c70da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 10368 bytes

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