Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a7cc2f54f59e12…

MALICIOUS

PDF

46.5 KB Created: 2020-04-06 03:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 92463456c7139975548095e9dcc08b34 SHA-1: abb5a6b7373ccc4ed271951e747a1423efa8b650 SHA-256: 60a7cc2f54f59e123136e47abda14b685892e117cb9d90c204f7b93474cd7153
96 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded external links pointing to various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the sheer volume of external links suggests a high likelihood of malicious intent.

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://avabaycompany.com/uploads/1/3/0/6/130621746/130621746.html#palabras+con+ll+y+ejercicios
    • http://shamrockcustomhouses.com/uploads/1/3/1/4/131437701/512030e75.pdf
    • http://dollarsockstock.com/uploads/1/3/0/7/130774994/xibavo.pdf
    • http://swogcharleston.com/uploads/1/3/0/7/130776358/651627.pdf
    • http://windowtintingtempeaz.com/uploads/1/3/0/6/130620263/ad673f6b1e8e.pdf
    • http://davidhopkins.info/uploads/1/3/0/6/130604637/6671717.pdf
    • http://faymariedesigns.com/uploads/1/3/1/3/131382018/02db6.pdf
    • http://walkinsyd.com/uploads/1/3/0/4/130488217/xolobo.pdf
    • http://atouchofhomestaging.com/uploads/1/3/0/7/130775196/sijaresogoruvetudu.pdf
    • http://sienahoefling.com/uploads/1/3/0/4/130483836/jikenuzit.pdf
    • http://biurorachunkowe-krystynalenczowska.pl/uploads/1/3/0/5/130588159/93dfbf77cf.pdf
    • http://tilstonvillagestore.com/uploads/1/3/0/6/130639123/givegasis_kivawideti_zufumolelixuv.pdf
    • http://apnapunjabilawyer.com/uploads/1/3/0/5/130590208/6693855.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c9e.bin
1b4d8f0965dcbcb073bfd02a4fe29b5e4c7785a300e7fe09708799a556179217
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9E 8712 bytes
font_01_sfnt_off00008c16.bin
78116880e9c902c31767bfa12a9ff84ada309181a52ab1aa29cdf6fbfe115b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C16 2600 bytes
font_02_sfnt_off00009542.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9542 16204 bytes