Malicious PDF — malware analysis report

Static analysis result for SHA-256 700d2dcb1cc7f751…

MALICIOUS

PDF

49.5 KB Created: 2020-04-19 17:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eff55e190882469b7201150cd14c43d4 SHA-1: d20a3d6cadba3aa7d5a451989f459bbc09c48d81 SHA-256: 700d2dcb1cc7f751a79ff838c735aa3915c00aaf6b39931ef147d34114971922
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to redirect users to potentially malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ziranesa3.com/uploads/1/3/0/9/130969441/130969441.html#the+losers+2010+movie
    • http://nashvilletrees.net/uploads/1/3/0/6/130604288/poketex_lexadubom.pdf
    • http://jamesdelbourgo.com/uploads/1/3/0/9/130969442/wafejepub.pdf
    • http://ejavery.net/uploads/1/3/1/3/131383323/e4157ccc72634c2.pdf
    • http://qingyangyang.com/uploads/1/3/0/4/130476145/8097032.pdf
    • http://alexmateer.com/uploads/1/3/0/3/130379354/7748742.pdf
    • http://spirithorsekingsburg.com/uploads/1/3/0/4/130476298/jezafisapitekoge.pdf
    • http://phoeneciang.com/uploads/1/3/0/7/130739952/bevujosafegotevud.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_off000098ca.bin
032f19541afee7a844f3fd178022aa533a14e9375cce4d269280e17c73fc84dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CA 9028 bytes

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