Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c3112e2b9f9770…

MALICIOUS

PDF

38.2 KB Created: 2020-03-22 13:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a9fd43ffdea13b11ed23f00311eda410 SHA-1: c7606c3d8774d01ce9812b83db09ccbefa273c4b SHA-256: 75c3112e2b9f9770c55149dd1c209d15d2648fb8c0fad1d2616c03cac4fb5aca
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external links. While no scripts were directly extracted, the presence of numerous URLs suggests an attempt to lead the user to potentially harmful content.

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://urfacefix.com/uploads/1/3/0/6/130622084/130622084.html#minecraft+how+to+make+a+guardian+farm+1.14
    • http://v8france.com/uploads/1/3/0/5/130545021/2357259.pdf
    • http://simplybakon.com/uploads/1/3/0/2/130288600/makasomul-rigaf-soxowafes.pdf
    • http://n-vest.com/uploads/1/3/0/3/130379287/9747177.pdf
    • http://webmail.flolights.org/uploads/1/3/0/4/130483050/3763162.pdf
    • http://leydikerfamilylaw.com/uploads/1/3/0/2/130289189/titinolu-sefenowi-kenobisiraz-nowufepebesomib.pdf
    • http://m.spiritual-research-network.com/uploads/1/3/0/6/130620736/a0d5f519de2.pdf
    • http://natgilbert.com/uploads/1/3/0/2/130289426/6668157.pdf
    • http://probity13.pleasingfood.com/uploads/1/3/0/5/130546497/601b165a0.pdf
    • http://eikumpel.com/uploads/1/3/0/4/130476427/d960187b1a79c0f.pdf
    • http://lmwaterfalls.co.uk/uploads/1/3/0/7/130739313/712281.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_off00006e8e.bin
2e64a5b1ba8846acc3adfb6246afd2f24b1b8fbdd25cc2a8c7f88aac9c0908ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 7400 bytes

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