Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c0164db22ebaec…

MALICIOUS

PDF

39.2 KB Created: 2020-04-05 11:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ecb175bd7c2b018f0f87fdb60f74a0f2 SHA-1: fff40f7b32656ab7e359078deed33e55b9f1d5bd SHA-256: 99c0164db22ebaec1da5fd8cdc11684b532288011e9a830a84d188187571e649
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO poisoning or to direct users to malicious websites. The ML classifier strongly flagged this PDF as malicious. The embedded links point to various domains, suggesting a broad distribution effort. No scripts were extracted, and the document body was heavily obfuscated, but the heuristic firings clearly indicate a link-farming or phishing attack pattern.

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://greenwolfverticalfarm.com/uploads/1/3/0/8/130813923/130813923.html#sistemas+dispersos+pdf+unam
    • http://biggsandcompany.org/uploads/1/3/0/3/130313070/mosasipe.pdf
    • http://mrdata.shop/uploads/1/3/0/6/130621785/mewolutowijin.pdf
    • http://fnvv.com/uploads/1/3/1/4/131437253/5909126.pdf
    • http://burleypta.org/uploads/1/3/0/8/130874076/8833699.pdf
    • http://webmail.scotmailing.com/uploads/1/3/0/6/130639630/pilubix.pdf
    • http://jasminempls.com/uploads/1/3/1/4/131406930/dadifopozesujaxaro.pdf
    • http://pacificcarehome.net/uploads/1/3/0/8/130874516/kewuburesu.pdf
    • http://rpk-concrete.com/uploads/1/3/0/7/130739776/5a2be.pdf
    • http://securitytitans.org/uploads/1/3/0/6/130621233/9202369.pdf
    • http://jetmarineshop.com/uploads/1/3/0/6/130605390/34a9f3d4a60ddbb.pdf
    • http://reimak.com/uploads/1/3/0/6/130604654/fojegakuveripave.pdf
    • http://harmonyhorsing.com/uploads/1/3/0/9/130969183/34523d7875c68da.pdf
    • http://velvetroses.net/uploads/1/3/0/7/130739712/mebetolukukux.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_off00006e70.bin
e1f67118c0f5bb28e7deabf62e518e8d0111205723aa8bf32b3b2fc9c37ed23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E70 8744 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.