Malicious PDF — malware analysis report

Static analysis result for SHA-256 7567c37499e41a3d…

MALICIOUS

PDF

37.7 KB Created: 2020-06-23 06:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ea20d63e13b4d03f76465374ed1fed7 SHA-1: e23a4d2ace03b15f53a69d49385cd44320316efb SHA-256: 7567c37499e41a3d6e3b4e54fc639be04faa6679aa92b1bd6e62137cafa40eee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a "link farm" technique, embedding numerous external links under the guise of providing a "Kundalini reiki manual download". The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a large number of external links, many of which point to other PDF files. The document body text is heavily obfuscated but contains references to the lure and some of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://shopskincarensc.com/uploads/1/3/2/6/132682737/132682737.html#kundalini+reiki+manual+download
    • http://endlesshappiness.org/uploads/1/3/0/6/130639036/124888.pdf
    • http://mx.gmoffattfurniture.com/uploads/1/3/0/6/130604758/bamaz-natuto.pdf
    • http://mx.ohioawnings.com/uploads/1/3/1/8/131856143/tuwukalupebop.pdf
    • http://650movement.com/uploads/1/3/1/4/131454126/memedisitot-xeteb-nejimuburemuk-rekomi.pdf
    • http://homiewear.com/uploads/1/3/1/4/131453871/vulinukelaku.pdf
    • http://mx.willardhopefest.com/uploads/1/3/0/7/130738915/ziwokinotez.pdf
    • http://mail.cindypeng.com/uploads/1/3/0/9/130969415/2f1d63913.pdf
    • http://academievoorhetleven.nl/uploads/1/3/0/7/130775379/9875615.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_off00005b06.bin
8f36eb5d71852b34146bf3c49c15c034057a06236bd4492a0c987ac6ab911425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 4720 bytes
font_01_sfnt_off00006af1.bin
85d47d02c8811738aaaa2c986438ab0d831f059e678a99fcb414841371fc3fa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 9352 bytes

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