Malicious PDF — malware analysis report

Static analysis result for SHA-256 197088a3fe111ddd…

MALICIOUS

PDF

31.3 KB Created: 2020-04-04 08:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cd8a07638a36a80d924c50c1c5798f00 SHA-1: d6ae60515dba1050d778c66ee7de50c3d31f772d SHA-256: 197088a3fe111dddb481991696a2498dcefe11cd4b4ca0b6dd9d99ba7fb7dd54
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The document body, though partially corrupted, contains a URL that appears to be a lure for a movie title, suggesting a social engineering pretext. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful sites.

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://chichesterfootandankle.org/uploads/1/3/0/8/130814122/130814122.html#en+llamas+pelicula+completa
    • http://hmgaccounting.com/uploads/1/3/0/8/130874641/8cff6140a804c8a.pdf
    • http://promaganza.com/uploads/1/3/0/3/130380037/woposatusubet_majivogawavo.pdf
    • http://wrenchmonster.org/uploads/1/3/0/3/130313213/6658487.pdf
    • http://absolutewater.net/uploads/1/3/0/6/130603979/ae0727e871fd.pdf
    • http://fedrika.com/uploads/1/3/0/5/130541272/dazolazo.pdf
    • http://destinationinnovation2012.ca/uploads/1/3/0/7/130739153/a3742d7.pdf
    • http://crpmechanical.com/uploads/1/3/0/8/130813521/totumowu_simobuwokilufe_dedibobo_nidawe.pdf
    • http://sendshittomyenemy.com/uploads/1/3/0/5/130539102/fumuzili.pdf
    • http://rwpdivephotography.com/uploads/1/3/0/6/130605248/20e8febf6.pdf
    • http://myhierthailand.com/uploads/1/3/0/6/130603982/zejaj-wuzisejesenaso.pdf
    • http://marlive.mobi/uploads/1/3/0/9/130969301/dopubutusiril_miguf_furuxap_pesax.pdf
    • http://anderson-sean.com/uploads/1/3/1/4/131407572/276009.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_off000051fe.bin
511bb87c66bcf642989f79d86ff025170d51e9cf2f8160b52b88b6b30b644d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FE 7800 bytes

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