Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abacc4763ded757…

MALICIOUS

PDF

43.4 KB Created: 2020-04-07 12:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c1efb60d63d5c859d93effdcfaa4395e SHA-1: 27d56f9d01817aa85ef7831eeec1d28fd82ec637 SHA-256: 0abacc4763ded757fdff3ee8cb0653b907b2e2d6309c7b9dfbd9163abb1df0ad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of embedded external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs.

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://churchstrettontaxi.com/uploads/1/3/0/6/130604724/130604724.html#alcances+de+los+procesos+de+la+investigaci%C3%B3n+cuantitativa
    • http://youngartistmemphis.com/uploads/1/3/0/7/130740010/60a1ce.pdf
    • http://vnecessities.com/uploads/1/3/0/6/130604448/zepoxujujinib-zenetas-legotixoxaxo-varanu.pdf
    • http://freedomunioncouncil.com/uploads/1/3/1/0/131070213/4554378.pdf
    • http://thefrights.org/uploads/1/3/0/8/130814346/5b0e344d39bec7d.pdf
    • http://coordinatedchaos.org/uploads/1/3/0/2/130289801/xoxamepu_xunatipifi_senuw.pdf
    • http://mail.vanvliet-kassenbouw.nl/uploads/1/3/0/4/130483341/22d4bd7dcd11b8.pdf
    • http://aurobole.com/uploads/1/3/0/5/130542940/lapuvuxetikuwa.pdf
    • http://affordablemosquitocontrol.com/uploads/1/3/0/8/130873903/kimemulenan.pdf
    • http://npbusinessconsultants.com/uploads/1/3/0/6/130621583/simutigena.pdf
    • http://madisonclassof87.com/uploads/1/3/1/3/131380755/tagevob.pdf
    • http://thefreespiritnetwork.com/uploads/1/3/0/6/130621003/bitoko_lajezevawepi_pokokolidof_nusofesiger.pdf
    • http://muhanmarketing.com/uploads/1/3/0/5/130541763/8911653.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_off00007d9b.bin
b1395b151e4eb57792e3d72088e84f216c83f4d999eeb4986daa6980d02c07bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9B 8980 bytes

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