Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2dbf392df22eea…

MALICIOUS

PDF

38.1 KB Created: 2020-03-31 19:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2add03edc3ed4b1eae2772820903b5cd SHA-1: 2b56c3114a5515c763507339c32084875bb70875 SHA-256: ef2dbf392df22eea4bf03825e65a0f79effc2b07ab960c41c7eadbbe2c8a49ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file exhibits characteristics of a link farm, containing numerous external links to various domains. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, suggesting the document's primary purpose is to direct users to a network of websites. The embedded URLs, such as http://leahdeleau.com/uploads/1/3/1/4/131452816/131452816.html#real+life+barbie+doll+without+makeup and http://fortitudecapitalmgt.com/uploads/1/3/0/7/130775455/3a272.pdf, are indicative of this pattern. The ML classifier also 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://leahdeleau.com/uploads/1/3/1/4/131452816/131452816.html#real+life+barbie+doll+without+makeup
    • http://fortitudecapitalmgt.com/uploads/1/3/0/7/130775455/3a272.pdf
    • http://johnreidyfinearts.com/uploads/1/3/0/5/130588425/kolabuzopadibu.pdf
    • http://ahomemadesimple.com/uploads/1/3/0/7/130738903/diribepifuluk.pdf
    • http://lifecircustampere.com/uploads/1/3/0/2/130289317/8740168.pdf
    • http://holisticnutritionguru.com/uploads/1/3/0/7/130739764/6611260.pdf
    • http://lmmsbeatsforlife.com/uploads/1/3/0/5/130589144/kogezuk.pdf
    • http://decksofatlanta.com/uploads/1/3/0/5/130588775/titakaredovaba_gasozakaxakud_mofev.pdf
    • http://nextheartbeat.com/uploads/1/3/0/7/130776132/robagiratogerado.pdf
    • http://landsharkthreads.com/uploads/1/3/0/8/130874359/tafenuzotanafan_zuguxuvasulem_xotimegoje.pdf
    • http://filmsolo.org/uploads/1/3/0/8/130814407/4cbde.pdf
    • http://capstonecenters.com/uploads/1/3/0/8/130814360/9180351.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_off00006b92.bin
a4186f08bd99fb6a9e5b455fc181e20eb4d946e4f8ef4363002b8d8ce5eac8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B92 8344 bytes

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