Malicious PDF — malware analysis report

Static analysis result for SHA-256 7718a1d9d1cf2997…

MALICIOUS

PDF

53.0 KB Created: 2020-05-17 04:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 524eb7cfff5a7645905d74b851e1b7bb SHA-1: 1ae04418268fc90452629adce057a1fd05b3e0fa SHA-256: 7718a1d9d1cf29978dbc5ba1c24d7baec1f823048e5c911e178e603ff22a047c
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 different domains. This pattern is indicative of a link farm or a mechanism to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://karenmayoartinmylife.com/uploads/1/3/0/4/130491356/130491356.html#minecraft+crafting+guide+1.+8.+2
    • http://maupin.net/uploads/1/3/0/4/130436139/5850938.pdf
    • http://abygailsphotography.com/uploads/1/3/0/2/130289496/lofesevawug.pdf
    • http://mcgarveyservices.com/uploads/1/3/1/6/131606047/d20bb1346d4bdb.pdf
    • http://goactivegourmet.com/uploads/1/3/0/8/130873907/vazusuvog.pdf
    • http://shenabclothing.com/uploads/1/3/0/7/130739828/e0c1376c97.pdf
    • http://roopasboutique.com/uploads/1/3/1/4/131483557/2779200.pdf
    • http://tuncon.net/uploads/1/3/0/6/130621278/fodukan.pdf
    • http://glitzpageantrentals.com/uploads/1/3/1/4/131408100/ruravef-parefamibetemub.pdf
    • http://shelleyrichardson.net/uploads/1/3/0/5/130539768/junobenategusisoku.pdf
    • http://ducktards.com/uploads/1/3/0/2/130288554/jepurisapevamagulig.pdf
    • http://evergreencapital.org/uploads/1/3/0/2/130289557/8927643.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008eef.bin
4ed5416198d1a78e92697429313d5e6375b3f2e1c90dd893fb97fbbe2132e81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEF 10524 bytes
font_01_sfnt_off0000b2ff.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 16204 bytes

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