Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddbf801ee003657…

MALICIOUS

PDF

41.6 KB Created: 2020-06-22 23:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 952fa30c20259029681daaf115b51450 SHA-1: 3f5ec2a479cf0435fc21b17b64a94d3787c7e235 SHA-256: 5ddbf801ee003657cc1edb6425ab3efc581b63826675d2108a28b4164c7138d1
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are obfuscated or use numeric slugs, indicating a link farm designed to distribute malicious content. The document body, though partially corrupted, includes the text 'Transfer case identification guide' and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious nature of the embedded links. The ML classifier strongly flagged this PDF as malicious.

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://mta-sts.mx.oldsoulholistic.com/uploads/1/3/1/4/131454304/131454304.html#transfer+case+identification+guide
    • http://oakridgestables.co.uk/uploads/1/3/0/5/130551505/vukudobetama-boketajasamosa.pdf
    • http://ksspace.net/uploads/1/3/0/7/130776374/6706265.pdf
    • http://treatyourselflikeyoumatter.com/uploads/1/3/0/7/130776699/172139.pdf
    • http://2yh.undesirable.us/uploads/1/3/1/3/131398025/panile-wetadig.pdf
    • http://gazelleproductions.com/uploads/1/3/0/8/130874055/6ee5d07bae9dca1.pdf
    • http://eaglehostel.com/uploads/1/3/1/6/131637483/7442199.pdf
    • http://personaly.nl/uploads/1/3/0/4/130476141/jedud.pdf
    • http://2zm.undesirable.us/uploads/1/3/0/5/130550910/6938965.pdf
    • http://backtobasicsdogtraining.com.au/uploads/1/3/0/5/130541221/tukofezepeson_muxumabojidu_debalexegifa.pdf
    • http://alanewingbooks.com/uploads/1/3/0/4/130488734/4855010.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006470.bin
7460ef12ca4433a0d52e0e13842071126c877300fbac2d13254f59d5327af456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 4988 bytes
font_01_sfnt_off00007568.bin
95acf347d91c954e3fb631c2c6904c0e4ab7a848bfb45c092ce6cb15d8a381d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10888 bytes

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