Malicious PDF — malware analysis report

Static analysis result for SHA-256 95adf45a4a194d09…

MALICIOUS

PDF

33.1 KB Created: 2020-04-05 14:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b0ffb62d889fa5cb231875c6955a8fb SHA-1: 63884eebd39d490e6fd847ad780b451c805dade1 SHA-256: 95adf45a4a194d09e44231e937d5f88108781afd030b1657acf124735c70caf4
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on newly created domains and appear to be part of a link farm designed to attract search engine traffic. The document body, though partially corrupted, contains text related to free PDF downloads, suggesting a lure for users. The ML classifier strongly indicated maliciousness, and the presence of numerous suspicious URLs points towards a distribution or phishing campaign.

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://blockchainambassador.ca/uploads/1/3/1/0/131071295/131071295.html#contabilidad+general+erly+zeballos+pdf+descargar+gratis
    • http://virtuoldesigns.com/uploads/1/3/0/4/130476976/b54a9277c17.pdf
    • http://templeofdeliverance.org/uploads/1/3/0/4/130483986/27c4206.pdf
    • http://northeaststrategies.com/uploads/1/3/0/5/130551859/5811005.pdf
    • http://nhappyandbeautiful.store/uploads/1/3/0/6/130604902/pobuxeta_sunaziwo_lakokojijubenis.pdf
    • http://teachmecfd.com/uploads/1/3/0/5/130588922/7ac0aed2a89259.pdf
    • http://tej2015.com/uploads/1/3/0/2/130272853/9032662.pdf
    • http://h2hydrofit.com/uploads/1/3/0/3/130323469/7c7d96.pdf
    • http://sambennettfishing.com/uploads/1/3/0/5/130551619/2048805.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_off000057a9.bin
d070563d9a1fa072680bfc83f2e9bdf049d89983a2b90b158d89d1e8bde9579a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A9 8208 bytes

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