Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e968389dd058ca…

MALICIOUS

PDF

47.5 KB Created: 2020-03-29 02:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7adcaaeef94b41049e940dbdee38bedd SHA-1: 3cd85334d5ff85df4f30e77bf7b99fec9e381922 SHA-256: 69e968389dd058ca239493b61245d05cd8cbccc2c1ed2758ca9cd2f484d5bfd4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 obfuscated, contains a URL that is repeated among the many external links. This suggests a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages.

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://lists.accordionapocalypse.com/uploads/1/3/0/9/130969485/130969485.html#carbon+and+its+compounds+class+10+ncert+book+pdf
    • http://thatcleverthing.com/uploads/1/3/0/4/130483147/gejikirepijarobiki.pdf
    • http://strategycardgames.com/uploads/1/3/0/5/130540567/8290268.pdf
    • http://slipnklick.com/uploads/1/3/0/5/130541763/wilozup.pdf
    • http://skylinegaming.net/uploads/1/3/1/3/131398017/4172212.pdf
    • http://kindledyouth.org/uploads/1/3/0/6/130620251/0fb1ee6b3.pdf
    • http://studio1999.shop/uploads/1/3/0/4/130477309/losun_gagodijofap_senov_xakoxere.pdf
    • http://forthtradeservices.co.uk/uploads/1/3/0/9/130969706/562053fa8f82dce.pdf
    • http://bffslime.com/uploads/1/3/0/8/130874046/gewijetode_dixusazesaxosi_mopivixedupewi_pujenavuk.pdf
    • http://nicolettabuildingcontractors.com/uploads/1/3/0/4/130436033/wekasejap_penuwokilo_mimufi.pdf
    • http://millsdigital.com/uploads/1/3/0/6/130604101/vujalix-rupovomovaxi-nisusonexuvow.pdf
    • http://www.doublelinsulation.com/uploads/1/3/0/6/130604377/d4a55d3a.pdf
    • http://www.devotionaleroticdance.com/uploads/1/3/0/6/130604864/wekagapajenab.pdf
    • http://reviews4reviews.com/uploads/1/3/0/4/130493714/8147630.pdf
    • http://mta-sts.mx.owlhavenfarm.com/uploads/1/3/0/5/130589123/764748.pdf
    • http://bartlove.com/uploads/1/3/0/9/130969588/miguvowovixib-dimin-medivezoj.pdf
    • http://brandimcmillan.com/uploads/1/3/0/3/130313169/6247500.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071cd.bin
3c886ff44ad100a1f71bb49c22034b73e814dc90bf6f8632f24e410a689bf247		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 8080 bytes
font_01_sfnt_off000090db.bin
17e0d51dd3ddd29f4888ae5e849982e39ead0d7b15e0521e7ace4aa8474ae498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DB 2780 bytes
font_02_sfnt_off00009ab4.bin
5a9695438bb362a8b10d86f415c06da9d71f416851af8c6c9c762304ce3c8158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB4 16088 bytes

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