Malicious PDF — malware analysis report

Static analysis result for SHA-256 183ba18e981c1465…

MALICIOUS

PDF

38.8 KB Created: 2020-06-07 00:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066d2d489a5fb6cc803b7be1c18d1374 SHA-1: b5684b432143d248fd77dea47cde4637b763bcc0 SHA-256: 183ba18e981c14658beca566ba702a8effceaec4a5fd7e101d3b1aeffe51f650
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to other PDF files on newly registered domains. This pattern is indicative of a link farm or SEO poisoning attack, potentially used to distribute malware or phishing content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

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://74-123-76-213.mgwnet.com/uploads/1/3/0/2/130289645/130289645.html#el+lenguaje+del+adios+pdf
    • http://thecrownsportspub.com/uploads/1/3/0/4/130488165/xapoguvinevev-fuvuzilotaj-gozarolurif-werirewuv.pdf
    • http://calvinmousavi.com/uploads/1/3/1/4/131406071/dd58bf72.pdf
    • http://mysite147956.esivu.fi/uploads/1/3/1/3/131381259/rapuk.pdf
    • http://corleys.org/uploads/1/3/0/4/130488839/xidulasopixim-mozis-gobixofibo.pdf
    • http://weestream.com/uploads/1/3/1/3/131380745/4682353.pdf
    • http://pnwwalks.com/uploads/1/3/0/5/130551696/5949641.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tajarumomix495663631.files.wordpress.com/2020/06/rukesanatemazuleresapuja.pdf
    • https://koxowite.files.wordpress.com/2020/06/39589200426.pdf
    • https://petatuw.files.wordpress.com/2020/06/mulezezepetodofotexunuba.pdf
    • https://moguvipofe.files.wordpress.com/2020/06/putilaneginuzil.pdf
    • https://delepozafejo.files.wordpress.com/2020/06/67543038887.pdf
    • https://dowutoweviki.files.wordpress.com/2020/06/xufegaratoxazum.pdf
    • https://povodijagez.files.wordpress.com/2020/06/wepegufukinigotedoso.pdf
    • https://fofukev.files.wordpress.com/2020/06/62159657341.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_off00006c09.bin
3998be2ca233560986eedc90cecd3f1925eea5d622737cd9ea8749bd2889bc7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C09 10984 bytes

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