Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fbeba8e0bb4629…

MALICIOUS

PDF

34.4 KB Created: 2020-04-04 11:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7aba56730bc37c768f2958376ffa2cd8 SHA-1: 324d9388c2494a342dacf5fbc360cda009cf4df6 SHA-256: 07fbeba8e0bb46296316733ff554365377ba9dff9eb40a08d0986080a5c65dbb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body also contains a primary URL that leads to an HTML page with similar link farm characteristics. While no scripts were explicitly extracted, the structure and numerous external links suggest a malicious intent, possibly for SEO manipulation or to distribute further malware. The ML classifier strongly supports the malicious verdict.

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://kmipropertieslimited.com/uploads/1/3/0/7/130739087/130739087.html#at+robertson+word+pictures
    • http://jacksonrichardcampbell.com/uploads/1/3/0/8/130874564/5125511.pdf
    • http://lapen.us/uploads/1/3/0/5/130552017/ffda5e28.pdf
    • http://mamatriberva.com/uploads/1/3/0/7/130739131/nunavaninajokiz_vivifamol_fajini_gijefemuwe.pdf
    • http://pizzapalace.shop/uploads/1/3/0/3/130379590/mugupirogifanos.pdf
    • http://fondationahowanou.org/uploads/1/3/0/2/130273581/xuditigepom-xulikikino-suzuf.pdf
    • http://belserenterprise.com/uploads/1/3/0/3/130324005/binuvowetepivu_liwozoviligikes_wawopodegisef_simites.pdf
    • http://roncocamana.com/uploads/1/3/0/8/130874495/a16961122bad.pdf
    • http://dipvac.org/uploads/1/3/0/9/130969465/luwenikasabe.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_off00005ef4.bin
c313827b53c4e76127e886381dd05033533d82ff7d17a5b38ec8dcfc4f9a8f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF4 7724 bytes

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