Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1366f4b1e65244…

MALICIOUS

PDF

46.1 KB Created: 2020-06-12 07:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de062ce607ac0ebdcdaeb0d362a4e80e SHA-1: 953819acc7061b14e81d629e2cd23a50b0755464 SHA-256: cd1366f4b1e652441ddcea9a89dd211e9ffe365efd44621b36e98a0411658edd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body also contains a subset of these URLs, suggesting a deliberate attempt to redirect users. The ML classifier strongly indicated maliciousness, supporting the interpretation that this is a link farm or distribution mechanism for other malicious content.

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://ritcherphotography.com/uploads/1/3/1/4/131406433/131406433.html#exercises+at+a+desk
    • http://williamsgroupja.com/uploads/1/3/1/4/131452870/lubexugop-bibimenibowisi-xupamujaweg-rogegawibasil.pdf
    • http://3y0.undesirable.us/uploads/1/3/1/4/131437880/lunufigesaxoxuf-vawanamemaloz-vumukebumafisa-jepasirowu.pdf
    • http://lozera.cz/uploads/1/3/1/3/131383377/d657816dc8617b8.pdf
    • http://friedpicklepod.com/uploads/1/3/0/7/130739532/mixuk-vizipuvexalena-babuteba.pdf
    • http://brughlandscaping.com/uploads/1/3/1/8/131872137/gebetor.pdf
    • http://xdgarchitecture.com/uploads/1/3/0/4/130483397/kabopejobo.pdf
    • http://sabinescottage.com/uploads/1/3/0/5/130539205/8dd1a256db5d.pdf
    • http://ready4golf.net/uploads/1/3/0/5/130588850/ximamuxonadoj.pdf
    • https://tizapes.files.wordpress.com/2020/06/95324418400.pdf
    • https://dumabodu.files.wordpress.com/2020/06/kazija.pdf
    • https://misawizotepu.files.wordpress.com/2020/06/mafuripedezefube.pdf
    • https://bifatapir.files.wordpress.com/2020/06/15000832889.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_off00008854.bin
d7af3c08d5663b30a4c05a0f1a839d52b4dafd30871ff1feffc7f401f226e162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8854 11000 bytes

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