Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc9eb7f7392ea7…

MALICIOUS

PDF

34.9 KB Created: 2020-06-03 20:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c1f38e3a849b3e58db4d9205b83a9b SHA-1: e3b3ee08d5dab217e21b628166509cc32b15b0b9 SHA-256: 65fc9eb7f7392ea7bcae0b4ebb6e273496c765977cbfc0d1ddb118b53b4d3765
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which appear to be part of a link farm designed to improve search engine rankings. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, which is a common social-engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kathleenstanko.com/uploads/1/3/0/6/130621409/130621409.html#time+warner+remote+control+user+guide+rc122
    • http://dmillerdev.com/uploads/1/3/1/0/131070520/2980970.pdf
    • http://puredentfamilycenter.org/uploads/1/3/0/8/130874620/531af8fcb4.pdf
    • http://alexaswork.com/uploads/1/3/0/5/130589010/zinaka-diwodewib-kazavod-xesopelos.pdf
    • http://cpcontacts.annapolisheirlooms.com/uploads/1/3/0/6/130621510/7355726b32f.pdf
    • http://alexcarson.net/uploads/1/3/0/8/130873895/bebowevowokes-jopanavaz-gugixufe.pdf
    • http://mail.estimatingsolutions.net/uploads/1/3/1/4/131437583/fc2729f.pdf
    • http://memhtmltutorials.minksfamily.com/uploads/1/3/0/6/130639896/1312089.pdf
    • http://nordphi.com/uploads/1/3/1/6/131637362/495642.pdf
    • http://baracom.org/uploads/1/3/0/4/130476896/87d16523480f62.pdf
    • http://essome.com/uploads/1/3/0/3/130323616/a3d6d74f1f4.pdf
    • http://mail.crossfitkilkenny.ie/uploads/1/3/1/4/131483053/rodojegurubokupikej.pdf
    • http://badassmortgageguy.com/uploads/1/3/1/3/131384226/8622330.pdf
    • http://kathleenstanko.com/uploads/1/3/0/6/130621409/terms.html
    • http://kathleenstanko.com/uploads/1/3/0/6/130621409/dmca.html
    • http://kathleenstanko.com/uploads/1/3/0/6/130621409/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://duvovufaseg.files.wordpress.com/2020/06/pozuzem.pdf
    • https://navurigafevu.files.wordpress.com/2020/06/gekavojupegadijupen.pdf
    • https://kujigeder.files.wordpress.com/2020/06/87690552159.pdf
    • https://zakudapure.files.wordpress.com/2020/05/nemigud.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1f.bin
c63a3a259ccad1049a0b3f6bd886c56e371d1e0594ad2fb596a4937b957450aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1F 9732 bytes

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