Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b4fe5cdc23e5a…

MALICIOUS

PDF

38.8 KB Created: 2020-03-20 03:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36da14c0c51d6d81de3aea7521dedc91 SHA-1: 6b224e4ad16bca083cd3b8fde9782bd85285b149 SHA-256: 549b4fe5cdc23e5a5c0daf08ef28d35c24a4d10c30a8a9e5ad4e3c86fb04331a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the numerous external links.

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://primelineresinsinc.com/uploads/1/3/0/7/130775969/130775969.html#palabras+con+mas+faltas+de+ortografia
    • http://campbell-france.com/uploads/1/3/0/5/130543996/6561349.pdf
    • http://allenhomestaging.com/uploads/1/3/0/7/130739537/ed8a084314f.pdf
    • http://brakor.no/uploads/1/3/0/5/130588880/risuxunubusi-puxijafun-wufodaxojaxevas.pdf
    • http://www.dragoonindustriesllc.com/uploads/1/3/0/5/130589151/709875.pdf
    • http://www.housepaintersaustin.net/uploads/1/3/0/4/130476541/lomerasokomuvufa.pdf
    • http://yoanstudio.com/uploads/1/3/0/6/130639839/sudisufidasaxos.pdf
    • http://wangshangtaiyangchengbaijialeyouxi.f18.ebkf.org/uploads/1/3/0/7/130776718/e91debd9.pdf
    • http://safecleanasc.com/uploads/1/3/0/4/130476104/e2c94c651e4.pdf
    • http://thebridgeyouthcenter.org/uploads/1/3/0/3/130323328/f3c98.pdf
    • http://apocalypse.shop/uploads/1/3/0/4/130436410/c34fda23dab4.pdf
    • http://www.livefullyknownfullyloved.com/uploads/1/3/0/6/130620325/zonosarovo_bitazujaxu_rapaxujaredu.pdf
    • http://phdentists.com/uploads/1/3/0/6/130639491/fobetozoduwademe.pdf
    • http://palosverdesplumber.net/uploads/1/3/0/4/130435978/5117486.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_off00006d0a.bin
0d60644cec56908cd2886b2ebeb53fba4a35f2f3c1331bfcd99b6aab3e8c8d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0A 8588 bytes

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