Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab54956b40971c08…

MALICIOUS

PDF

41.5 KB Created: 2020-04-02 10:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11bb9d9119f0be0b9d8b70b465d8e86d SHA-1: 866e14cc7b14c30d87f869511a6f9b9b9bfa4583 SHA-256: ab54956b40971c08f01ffce76316b9719112232380714a06a814499e56cd24ec
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a reference to 'Inecuaciones de primer grado problemas resueltos' and the wkhtmltopdf generator, suggesting a lure document. The primary attack pattern involves redirecting users to a vast array of other PDF files hosted on numerous domains, likely for SEO spam or to distribute malware.

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://g6equip.com/uploads/1/3/0/7/130775934/130775934.html#inecuaciones+de+primer+grado+problemas+resueltos
    • http://khdentalgroup.com/uploads/1/3/0/8/130813654/nunevovoridu_zijalijozi_joveza.pdf
    • http://kasedetailing.com/uploads/1/3/0/3/130323547/junutudifetaxo.pdf
    • http://americanschoolofcharm.shop/uploads/1/3/0/6/130621405/sujinewa.pdf
    • http://capital-roots.com/uploads/1/3/0/7/130775607/wokubik.pdf
    • http://weeblee.net/uploads/1/3/1/4/131408664/seburovarok.pdf
    • http://sarahsfilmcreations.com/uploads/1/3/0/3/130379458/godokedoxefokir.pdf
    • http://steakclubdetroit.com/uploads/1/3/0/6/130620745/gorexafimurez_logekagukogaj_gebezomadidog_sonav.pdf
    • http://mylittlemutant.com/uploads/1/3/0/8/130874296/d57b52f0020f7c.pdf
    • http://gilleysnotaryservice.com/uploads/1/3/0/4/130436074/9725838.pdf
    • http://minsheentan.com/uploads/1/3/0/2/130271063/a6438.pdf
    • http://maderas3c.com/uploads/1/3/0/2/130289406/samunagekunet_bozixovil.pdf
    • http://dakotaadornments.com/uploads/1/3/0/6/130604983/nifezenebasegag.pdf
    • http://malaikagarden.com/uploads/1/3/0/5/130540046/vifilaxipebixetur.pdf
    • http://rockportrenovation.com/uploads/1/3/1/3/131379836/432203.pdf
    • http://solosgroup.net/uploads/1/3/0/3/130312929/7510944.pdf
    • http://rootadventure.com/uploads/1/3/1/3/131379594/09fa1.pdf
    • http://guardliberty.com/uploads/1/3/0/9/130969403/bajoxufitetar_woxexo.pdf
    • http://briorecordings.net/uploads/1/3/0/8/130874667/padifisu-menewezopura.pdf
    • http://jscompetence.de/uploads/1/3/0/7/130775164/wininiserabatakusoxo.pdf
    • http://datalyx.co/uploads/1/3/0/6/130621581/xubamoz.pdf
    • http://lifeaftermidnight.ca/uploads/1/3/0/4/130435843/7294721.pdf
    • http://walquistwriting.com/uploads/1/3/0/7/130775092/2345070.pdf
    • http://oa100.org/uploads/1/3/0/4/130488387/359ec109.pdf
    • http://vincentmillioud.com/uploads/1/3/0/6/130620912/4377829.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_off0000760c.bin
6124978963b5946b7d4fd9d70d6fb4cf37a9d0ef8809a42584690869ed73b993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760C 8896 bytes

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