Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ac83426b2aff8a…

MALICIOUS

PDF

34.9 KB Created: 2020-05-19 16:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cfca2f4ee829586c13f04ce4b156f37 SHA-1: 0a8f34f1278f501582b72bd6a766eae784599143 SHA-256: 17ac83426b2aff8ad2e4a8eaef9458842352d73ee1842c98a4337585382d124f
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 and HTML pages, a technique often used for SEO spam or to host malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://living-twenty.com/uploads/1/3/0/2/130271205/130271205.html#fruits+and+vegetables+english+worksheet
    • http://mintparents.com/uploads/1/3/1/4/131452753/9157537.pdf
    • http://clearmynameva.com/uploads/1/3/1/4/131407890/982043.pdf
    • http://thenotations.com/uploads/1/3/0/4/130489253/2517781.pdf
    • http://urbaninternational.org/uploads/1/3/0/5/130539888/6406929.pdf
    • http://elfimusic.com/uploads/1/3/0/7/130740044/zaruwadedip.pdf
    • http://unabhaengige-liftberatung.ch/uploads/1/3/1/4/131438294/luzidataja.pdf
    • http://idothework.com/uploads/1/3/0/6/130639679/jawewimofixu_xamukajulum.pdf
    • http://guilitherapy.com/uploads/1/3/0/6/130604527/5366809.pdf
    • http://players-lodge.de/uploads/1/3/0/9/130969683/1145701.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc6.bin
52d8589cb045bd757d99c0303ece2da026078f41352cc961e50b0d57bc99127d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC6 10132 bytes

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