Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4a24246817a2ba…

MALICIOUS

PDF

48.1 KB Created: 2020-05-19 01:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09b9b4f44d323481768324c528902a3b SHA-1: 976169318fb7cc0656b10084a2511397aab91248 SHA-256: 6c4a24246817a2bad0e687e17482077881b5e73214a702d43bce5d7c1b76064a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. These links likely serve to manipulate search engine results or to distribute additional malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://financialmeasurement.com/uploads/1/3/0/6/130640142/130640142.html#best+manual+knife+sharpener+2016
    • http://idwebwork-hardpaysoff.com/uploads/1/3/0/5/130550700/dewokalukezeji.pdf
    • http://ktburke.com/uploads/1/3/0/5/130543190/bakomapevexonun.pdf
    • http://movetounicoicountytn.org/uploads/1/3/1/4/131453354/pukogek.pdf
    • http://xaviscakes.org/uploads/1/3/1/3/131378840/jaxexoranu-xekisu.pdf
    • http://golattice.org/uploads/1/3/1/4/131453657/968487.pdf
    • http://bravearkitektkontor.com/uploads/1/3/0/8/130874082/5b20df4d.pdf
    • http://outsourceandgetrich.com/uploads/1/3/1/4/131408432/mimominuw-rudave.pdf
    • http://lidoasteria.com/uploads/1/3/1/6/131606803/mozasazetez_raxati_pijotaxo.pdf
    • http://alanagrech.net/uploads/1/3/0/2/130270911/xisamisuv.pdf
    • http://lalehkhorsandi.com/uploads/1/3/0/2/130272481/votubusatot_wivirujopubezak_mosure_bevufuna.pdf
    • http://intheboxathletics.com/uploads/1/3/1/6/131636602/7268971.pdf
    • http://cassyhemp.com/uploads/1/3/0/2/130271187/9876318.pdf
    • http://ryanmacedesign.com/uploads/1/3/0/5/130589058/wojinokezotakonip.pdf
    • http://skinmodality.com/uploads/1/3/1/4/131482907/6326483.pdf
    • http://orchinage.com/uploads/1/3/0/2/130289172/sagotasotenusibiw.pdf
    • http://tshaylaslayher.com/uploads/1/3/1/4/131438483/jibasamibumapepewes.pdf
    • http://lasvegasallrotary.com/uploads/1/3/0/5/130543766/5ada1.pdf
    • http://brenbranding.com/uploads/1/3/1/3/131379792/8683040.pdf
    • http://ariens-technicalservicesltd.com/uploads/1/3/1/8/131856333/jabotadamevadubu.pdf
    • http://vocalassociates.com/uploads/1/3/0/5/130550817/rofumogutipan.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009074.bin
04c325932ec0d07cb21d92488558b74d8fc7635e2124d473fcde7000a6c8583b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9074 10680 bytes

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