Malicious PDF — malware analysis report

Static analysis result for SHA-256 84510bada4ccfe18…

MALICIOUS

PDF

36.9 KB Created: 2020-11-06 05:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a12a1060469f8d6e3d4ed5d3086def5b SHA-1: 10c63133c555e0adee815c99d9c15f43421ce88f SHA-256: 84510bada4ccfe18adefcd61dcd29ce66f5267a875bfb660328f47decde9c142
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or SEO poisoning attack. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links aligns with techniques used to distribute malware or phish for information.

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 https://trafffe.ru/123?keyword=handbook+house+kurita+pdf
    • https://benukozememig.weebly.com/uploads/1/3/4/4/134480731/e9cc7b2788.pdf
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f8f31ee58f1a.pdf
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/8892025.pdf
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/c1a956094f51.pdf
    • https://wilunozuwi.weebly.com/uploads/1/3/4/4/134432110/vedoke.pdf
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f9fae310cb01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a6d38ec3-b833-40de-bbcb-4bc2a57117c3/90505357275.pdf
    • https://uploads.strikinglycdn.com/files/7a891baf-6944-4133-9902-e7b5d0a458ff/lusavebetopa.pdf
    • https://uploads.strikinglycdn.com/files/fd10e244-2112-49a8-bf8e-3e54d0da5e44/tricky_sql_interview_questions.pdf
    • https://uploads.strikinglycdn.com/files/9c2b65ad-022d-4e9b-8150-b4c8ed63f037/67244777238.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005254.bin
93318c6830ba8a135f87f7ad131e9f0e46dcbcc45bc9375c831b0460d32c9272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5254 5260 bytes
font_01_sfnt_off00006422.bin
ebe98f75d50f41cefbacde139d17ce94b37c2da16113d67b807c91cd9dd27626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 10424 bytes

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