Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a893a1852852f08…

MALICIOUS

PDF

40.2 KB Created: 2020-03-30 12:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2140fcab2475dac186f1d5e68c25698d SHA-1: 2fff778710bc7e82509a85d10fafbf4123767c99 SHA-256: 7a893a1852852f085160ab387ddeb1820690a1a3c922cdfde1f50f98045f8fe4
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

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://nles-boutique.com/uploads/1/3/0/2/130289498/130289498.html#como+resolver+ecuaciones+lineales+de+segundo+grado+con+dos+incognitas
    • http://www.erinduffybooks.com/uploads/1/3/0/5/130588256/purezebof.pdf
    • http://katdar.net/uploads/1/3/0/6/130604558/wazotisij_bovexumi.pdf
    • http://gimnasiagerencial.com/uploads/1/3/0/8/130873976/1273037.pdf
    • http://ruthiesgiftsandthings.net/uploads/1/3/1/0/131070753/5378120.pdf
    • http://ecocleannq.com/uploads/1/3/0/6/130639801/nevafurisupo.pdf
    • http://clucktruckportland.com/uploads/1/3/0/6/130603894/329043b730c24d6.pdf
    • http://beaconskinsurgery.com/uploads/1/3/0/2/130272976/sutug-donevipeboda-vutitekitegik.pdf
    • http://chsbraceletstore.com/uploads/1/3/0/5/130589302/gabuwapurimu_vagujifu_refexipomugobi_kosutupajagez.pdf
    • http://unavoceensemble.com/uploads/1/3/0/7/130776067/12b6736aa3.pdf
    • http://allan69.com/uploads/1/3/0/8/130814106/5296521.pdf
    • http://promisepublication.com/uploads/1/3/0/7/130739210/fc08161.pdf
    • http://randolphassociatesllc.com/uploads/1/3/0/4/130476120/4958927.pdf
    • http://welcometoevergreen2.org/uploads/1/3/0/4/130436513/e7713fc552ce.pdf
    • http://thebroadcompany.org/uploads/1/3/0/6/130621276/xugimaxuzejif_sikimovatogid_pudazat.pdf
    • http://chubbyschoice.net/uploads/1/3/0/6/130622024/guruj.pdf
    • http://svenerikgolden.com/uploads/1/3/0/8/130874521/9870594.pdf
    • http://mx.theeducationalfarm.org/uploads/1/3/0/5/130590594/9a2e40be877.pdf
    • http://devonhouseandhounds.com/uploads/1/3/0/7/130739540/pusinepupegaja.pdf
    • http://x-der.com/uploads/1/3/0/6/130605380/52f29d.pdf
    • http://myfiestaofeight.com/uploads/1/3/0/5/130590682/9971085.pdf
    • http://eva-uhhhh.com/uploads/1/3/0/4/130488619/22c66481.pdf
    • http://royaltybyrachel.com/uploads/1/3/0/2/130273738/bavivunad_ruxejo_gavadudux_meregere.pdf
    • http://j80na.org/uploads/1/3/0/5/130551001/5903651.pdf
    • http://drwheelerreviews.com/uploads/1/3/0/5/130544313/52efc87374.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007313.bin
dec7ec6179fb8a7797385256c40f2bb1d1541ed2c384f38ff4f0ba1bcc9f9b3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7313 7816 bytes

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