Malicious PDF — malware analysis report

Static analysis result for SHA-256 689a077d1ed89497…

MALICIOUS

PDF

35.5 KB Created: 2020-06-08 23:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee68116637947cfddf900307bab88afb SHA-1: 4001856082c6d6ab33084f2cf64709b3f6945e54 SHA-256: 689a077d1ed894970d227614575308f3b2ab961507ed98678f88f1cd4e2da258
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or SEO spam campaign, potentially used to distribute malware or lead users to phishing sites.

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://4wg.undesirable.us/uploads/1/3/0/2/130272443/130272443.html#beni+%25C3%25B6d%25C3%25BClle+cezaland%25C4%25B1
    • http://xonaturalstlc.com/uploads/1/3/0/9/130969835/peronevu-gimejaremugupuk-bogavarize.pdf
    • http://davidstephensonphoto.com/uploads/1/3/0/5/130588289/d68f35d8.pdf
    • http://yemencoffeeboard.info/uploads/1/3/0/5/130590416/821342.pdf
    • http://revival-recovery.com/uploads/1/3/0/7/130739052/051e319a7af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zeraperusute.files.wordpress.com/2020/06/miwozejesorudalawibuso.pdf
    • https://dezekifas.files.wordpress.com/2020/06/99196149441.pdf
    • https://vokizowonaso.files.wordpress.com/2020/06/49571467601.pdf
    • https://fogamadamin.files.wordpress.com/2020/06/vopujodipira.pdf
    • https://vazavuxoli.files.wordpress.com/2020/06/jibemakinadonadixinavo.pdf
    • https://xevugonabaw.files.wordpress.com/2020/06/79879251522.pdf
    • https://sabepata.files.wordpress.com/2020/06/67795729853.pdf
    • https://sudemik952135139.files.wordpress.com/2020/06/furexuwunewi.pdf
    • https://bewutorabat.files.wordpress.com/2020/06/susedafilimisogobako.pdf
    • https://doxigalik.files.wordpress.com/2020/06/rerivimurapemuj.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f14.bin
9cc4471c263f37b06c7c8db97c46ad6be283804319129aac834839f5a6e7d424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 10724 bytes

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