Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e56d1732e69b310…

MALICIOUS

PDF

114.7 KB Created: 2020-06-09 04:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 245c565c3799fb3a3ee709459d545723 SHA-1: 574abc05509c0c587a986410a0b46c7aceb940a0 SHA-256: 9e56d1732e69b310bcd6d4659fa640514ac76c2e0bd543577675913402a39870
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document is designed as a lure, masquerading as an answer key for 'Readworks.org'. It contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. This suggests a link farm or redirection strategy to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mx.elgaby.com/uploads/1/3/1/6/131636707/131636707.html#readworks.+org+answer+key+grade+8
    • http://westwaterfordcs.com/uploads/1/3/0/4/130478123/jexudagewelupal_fegokinezepe.pdf
    • http://nottageprimary.com/uploads/1/3/0/5/130543684/rapigolapogugot.pdf
    • http://frenyella.com/uploads/1/3/0/4/130488955/740991.pdf
    • http://beautecocktail.com/uploads/1/3/0/7/130775169/6102552.pdf
    • http://doolade.maraludwig.com/uploads/1/3/0/8/130874009/1fa9eeace.pdf
    • http://mta-sts.mail.macroswithmegs.com/uploads/1/3/1/4/131406784/61b761d698.pdf
    • http://anebike.com/uploads/1/3/1/3/131379295/tusegiwumud.pdf
    • http://deathbyyarn.us/uploads/1/3/1/6/131606782/47e987f843.pdf
    • http://hj-eiendomsutvikling.com/uploads/1/3/0/8/130814145/162374.pdf
    • https://miteduxom.files.wordpress.com/2020/06/21905403112.pdf
    • https://nepigipoduge.files.wordpress.com/2020/06/tebifezubo.pdf
    • https://dabujekikun.files.wordpress.com/2020/06/vanelanufunu.pdf
    • https://nibixodowoxo171687391.files.wordpress.com/2020/06/37560272959.pdf
    • https://zuketuvilo.files.wordpress.com/2020/06/xenotiruwubex.pdf
    • https://zeluvabumi.files.wordpress.com/2020/06/76437047989.pdf
    • https://nonepagok.files.wordpress.com/2020/06/pufigojekafolevulila.pdf
    • https://livasif.files.wordpress.com/2020/06/komekotapuxofaveteko.pdf
    • https://runogaf.files.wordpress.com/2020/06/44510656211.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_off000195f9.bin
43ce91bed14977e37d755621e20f481a6cee1d34997d4df6bfbc14bd2cf25e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195F9 12084 bytes

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