Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c08634c915519b7…

MALICIOUS

PDF

43.2 KB Created: 2020-03-23 12:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f73074ac21c8555265c9e1ebdc59107 SHA-1: 07c704af142abeefc4f3022ae21adc266b42530f SHA-256: 2c08634c915519b761451fbfaa29ee899952c0ba4f5c856001fb0b1bb79cd6cf
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, many pointing to other PDF files hosted on various domains. This pattern is indicative of SEO spam or a link farm designed to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly supports the malicious verdict.

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://142ellert.com/uploads/1/3/0/5/130589222/130589222.html#fallout+4+change+character+name+console
    • http://radtacular.net/uploads/1/3/0/4/130476575/6469178.pdf
    • http://jeremiahfranck.com/uploads/1/3/0/2/130289430/53a6ae1562085e.pdf
    • http://allyourbabes.com/uploads/1/3/0/6/130604758/karusefipelixenax.pdf
    • http://theartofbecomingresilient.com/uploads/1/3/0/6/130621244/6172204.pdf
    • http://madridelectricllc.com/uploads/1/3/0/5/130543285/wilabopum-lawufepetu.pdf
    • http://hostmaster.everyoneslearning.com/uploads/1/3/0/4/130483457/8158581.pdf
    • http://www.janis-lipinski.com/uploads/1/3/0/2/130287291/gekaz_modedidiko_tinexubug_ledefozirugewu.pdf
    • http://metamorphosisinblack.net/uploads/1/3/0/2/130291441/3838025.pdf
    • http://thetrixxband.com/uploads/1/3/0/7/130775557/9729013.pdf
    • http://www.kcdermodywriter.com/uploads/1/3/0/5/130589002/wefivokutuz_wufavotozitemu_pimajexojokidu_wurosukusolefoz.pdf
    • http://marcusdowell.mdcr1.com/uploads/1/3/0/6/130605521/e4607407748062b.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_off00007fc1.bin
6788a90a628b1e8560e6e602a244f51743261dc1d3bf81492ae95863ba149ab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC1 8312 bytes

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