Malicious PDF — malware analysis report

Static analysis result for SHA-256 097bcea97240c02b…

MALICIOUS

PDF

49.5 KB Created: 2020-04-06 12:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4c1d19724c129f95a9a36182249077c SHA-1: 0f716a17bc1e4389ab2653236899f339c2c53f06 SHA-256: 097bcea97240c02bff0344295493b490e2682403cf3613ddb14194cf037622bd
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous URLs suggests an attempt to direct users to potentially harmful content or to manipulate search engine results. No scripts were extracted, but the sheer volume of links points to a coordinated effort to host or link to malicious files.

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://mkelectricllc.net/uploads/1/3/0/6/130621582/130621582.html#konunsgard+god+of+war+nornir+chest
    • http://cemmeza.com/uploads/1/3/0/6/130621384/a88042da56.pdf
    • http://puddleduckfarm.com/uploads/1/3/0/9/130969434/tutozitomeb-vofon-titupogudaki.pdf
    • http://renovaid.xyz/uploads/1/3/0/3/130313307/kavazaw-nosasenabunime-kabisaxed-jomomixage.pdf
    • http://malibuseasideweddings.com/uploads/1/3/0/6/130620987/tagokutil.pdf
    • http://alpinelegendspixiebobs.net/uploads/1/3/0/5/130588581/ridogelolub.pdf
    • http://romanticsuspenseebooks.com/uploads/1/3/1/4/131407253/53bb2.pdf
    • http://steelinghearts.com/uploads/1/3/0/5/130589108/nadakim-kajob-kewadis-pepoterimagi.pdf
    • http://langhainhuan.org/uploads/1/3/1/0/131070247/6974942.pdf
    • http://staroftheseakillyleagh.com/uploads/1/3/0/3/130323672/421492.pdf
    • http://hittingthespiritualwall.com/uploads/1/3/0/7/130775598/lumegava.pdf
    • http://galaxygaming.xyz/uploads/1/3/1/4/131406173/taxireto.pdf
    • http://thewindypalace.com/uploads/1/3/1/0/131070230/792c1c1bda44.pdf
    • http://bergmannsampel.com/uploads/1/3/1/3/131384429/e14acac9f924f.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_off0000978f.bin
edd156625a4cf0f03ddd1c37f741f73690435e72ecbdaa5bbd80584969c2d82f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 8340 bytes

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