Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e7e831b0101da3…

MALICIOUS

PDF

35.4 KB Created: 2020-04-10 00:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f364cd657dc039f9ee441829c15118ba SHA-1: 5e3a1997851a27f574aa2c7eab0b144bc329ff5f SHA-256: 92e7e831b0101da32f1ee8627539d0942031e87977d8fb6f3b9284fc73c1f62c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern. The ML classifier also strongly flagged this PDF as malicious. The primary intent appears to be directing users to external websites, as evidenced by the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://espclicks.com/uploads/1/3/0/5/130590463/130590463.html#google+maps+batcave
    • http://hairden.org/uploads/1/3/1/3/131398447/4474400.pdf
    • http://sustainablesalessolutions.ca/uploads/1/3/0/6/130639978/luzimu-rapoxofujigimoz-kogili-tevur.pdf
    • http://wateryoukillingmefor.com/uploads/1/3/0/3/130313748/zufuxobezuwu-goporokivufix.pdf
    • http://thestephensons.net/uploads/1/3/1/3/131398489/4595334.pdf
    • http://omegastructuresvcllc.org/uploads/1/3/0/6/130604369/9859135.pdf
    • http://robynchotiner.com/uploads/1/3/0/8/130874614/9165377.pdf
    • http://browncf.com/uploads/1/3/1/0/131070481/8866527.pdf
    • http://candles.studio/uploads/1/3/0/4/130488500/6f5b3a430c53.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_off000061a8.bin
d426c85b33f2b0341a0e42925608e01537c774147c74096d864ad575f9efbad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A8 7796 bytes

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