Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aea1898bf02929f…

MALICIOUS

PDF

33.7 KB Created: 2020-04-25 15:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f41a28858a74f465744a882810c3cd48 SHA-1: 736ab8cff1451082a5a6d2073c1181cc7aefb79f SHA-256: 5aea1898bf02929fc3bf7b5d83b24e236d370e33290bb74ed6ed10eb71979fa8
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a link farm or redirection attempt. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely intended to lead the user to a compromised or malicious website.

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://tripanmarketing.com/uploads/1/3/1/6/131606343/131606343.html#auditoria+informatica+pdf+ejemplo
    • http://pastwares.com/uploads/1/3/0/9/130969183/logulazukud-bileritijeniru-gigixukud-wunusevuda.pdf
    • http://k-shift.com/uploads/1/3/1/4/131453065/d6b9533327d90.pdf
    • http://bedminsterexcavation.com/uploads/1/3/1/3/131383839/jixolebi.pdf
    • http://johnny-mary.com/uploads/1/3/0/7/130739922/dd8170037fadcb.pdf
    • http://vivianmora.com/uploads/1/3/0/4/130488398/loxalatiwamemeru.pdf
    • http://engagemeeducation.com/uploads/1/3/1/4/131453394/84f97b4d9634e3.pdf
    • http://peacedtogether.org/uploads/1/3/1/0/131070798/5980306.pdf
    • http://crtconcepts.com/uploads/1/3/0/8/130873908/4076724.pdf
    • http://zafferanopiemonte.com/uploads/1/3/1/0/131070125/supegaloxe.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_off00005a33.bin
7d2e8e23cb9ad07c6fccf7461282c70ef5d5050fe69982aaea9a8ad1abdfea7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A33 8752 bytes

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