Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a46e9c08480d76…

MALICIOUS

PDF

31.5 KB Created: 2020-05-11 05:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4b5657048f00268190225f9f1b0a3e2 SHA-1: 1e78798c67cd2b97184fe2b61a8e7f347cbd335b SHA-256: 94a46e9c08480d76983c022830c9930f98d549306d9ebafaa32f7a7be5765e38
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external URLs. The primary purpose appears to be directing users to a collection of other PDF documents hosted on various domains, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://directorsofficersliabilityinsurance.wales/uploads/1/3/0/6/130620390/130620390.html#manual+de+auditoria+financiera+gubernamental+2018+ecuador
    • http://ninesquareventures.com/uploads/1/3/1/3/131398411/8380170.pdf
    • http://paulgertler.com/uploads/1/3/0/5/130539774/vujogeraxezupivul.pdf
    • http://fauquiereyecare.com/uploads/1/3/0/4/130491322/4200316.pdf
    • http://davemacon.com/uploads/1/3/1/4/131453013/bevanalamuluvadone.pdf
    • http://lappartementhairboudoir.com/uploads/1/3/1/4/131437294/8694712.pdf
    • http://fantasyhomesolutionsusa.com/uploads/1/3/1/4/131438098/xavitaxodanawugapa.pdf
    • http://stepbystepmontessoriacademy.ca/uploads/1/3/1/3/131383826/gilidunonejo_dupitonarire.pdf
    • http://kellysporthorses.com/uploads/1/3/1/0/131070705/gupozujisusitiwev.pdf
    • http://ipwsporthorses.com/uploads/1/3/0/3/130323268/sevesof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00004f59.bin
1996a2669c9b154a348e07e85d0e542bad21737cacc966caf92ceba7ea4162da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F59 10712 bytes

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