Malicious PDF — malware analysis report

Static analysis result for SHA-256 10de250833b58ab7…

MALICIOUS

PDF

40.7 KB Created: 2020-03-07 15:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 74f1d0e813adf037d2e3fbe5a65b2f1d SHA-1: 75d76c4e9ed95c86d231df225e7f8948ba5b3de8 SHA-256: 10de250833b58ab7659c3b821ef3320a7929ab6f5b95e731c2630fbfc3a46368
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body itself is heavily obfuscated and contains garbled text, but it does embed URLs that are likely part of this redirection scheme.

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://yi7h6.slpny.com/uploads/1/3/0/4/130476607/130476607.html#table+tennis+tournament+score+sheet+excel
    • http://rootgreen.com/uploads/1/3/0/3/130313359/f7045b82.pdf
    • http://vostokimports.com/uploads/1/3/0/7/130740553/9e297aedec3.pdf
    • http://www.monikaryberg.com/uploads/1/3/0/4/130476243/4810849.pdf
    • http://miguelchanonafotografo.com/uploads/1/3/0/6/130640114/mowepepofozupekoguwe.pdf
    • http://admin.burridgeoliver.com/uploads/1/3/0/6/130604562/acfcf160b.pdf
    • http://aandnlawn.com/uploads/1/3/0/5/130543874/2440889.pdf
    • http://alfordtech.com/uploads/1/3/0/3/130313641/6cedd4ad1.pdf
    • http://mx.varajaolaw.com/uploads/1/3/0/6/130622106/damaze.pdf
    • http://katielyonpingree.net/uploads/1/3/0/5/130546209/4874023.pdf
    • http://mykindoffamily.com/uploads/1/3/0/2/130288392/nenotipevelad.pdf
    • http://www.navycapstore.com/uploads/1/3/0/4/130483307/wijoxifaju.pdf
    • http://nfmmchealthhome.com/uploads/1/3/0/4/130483303/9702233.pdf
    • http://biteables.com/uploads/1/3/0/3/130313434/varirote_kasit_pobixuxumizinut_ledilawudupubuf.pdf
    • http://northweststeamart-uk.com/uploads/1/3/0/4/130483739/buleb-robiwepe-xosutusu-jikitenulibo.pdf
    • http://montanahollidayglass.com/uploads/1/3/0/3/130323822/vapulos-fenizu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f0e.bin
37225dbc4dddbdc83767f88a28ad5b2a6f399bd4a20c30e89643914abd7ceb53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0E 7624 bytes
font_01_sfnt_off00008cf0.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF0 1708 bytes

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