Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac5de184db2a84f…

MALICIOUS

PDF

42.8 KB Created: 2020-04-10 04:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33f92aa62fcd63604b26cfd04ca063e1 SHA-1: 21d2d3d7e4bc9c61e859aad3c8b2f1cf26fcec24 SHA-256: 6ac5de184db2a84fb267337cb279a8af6fa4d32ae787c4512a090402fecf9af5
136 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are structured as SEO-optimized PDF links, suggesting a link farm or redirection scheme. The document body, though partially obfuscated, contains text related to a diagnostic exam and embedded URLs that are likely part of a phishing or redirection attempt. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security scanning by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://reikihealingbytaryn.com/uploads/1/3/0/6/130639100/130639100.html#examen+diagnostico+de+matematicas+3+secundaria
    • http://amseesamerica.com/uploads/1/3/0/2/130271004/1649744.pdf
    • http://summit4action.org/uploads/1/3/0/3/130379356/7920362.pdf
    • http://torbertsorangecorn.com/uploads/1/3/1/3/131384156/sapokugatoborowimez.pdf
    • http://skspackaging.net/uploads/1/3/0/5/130551065/febomikavetumub-xuveme.pdf
    • http://dominikamarvel.com/uploads/1/3/0/5/130588778/sawabinofid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e1c.bin
3600046e3e58031cb6bf6d76f6ec4a03d39721dad0abea112ed3c4c96654a4ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 9844 bytes
font_01_sfnt_off00009161.bin
dcf405c3bed5123aedd40afbbbecf35eaa261dd54e275e056a5fb722ed5a9194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9161 3208 bytes

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