Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9fee223433f6e…

MALICIOUS

PDF

39.1 KB Created: 2020-04-06 07:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1eecb485457de8d1313a7e295e47a81 SHA-1: 57b064c1ff04b9f4cce89616d0cda10f05932022 SHA-256: 8fd9fee223433f6e2f7c7b84d6356d46f16962e88fc7793de085662d4f67ecb1
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, suggesting a malicious intent to manipulate search engine results or distribute malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links points to a content-distribution or SEO-poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://iavnt.com/uploads/1/3/0/5/130588657/130588657.html#prueba+de+cortocircuito+y+circuito+abierto+en+transformadores+monofasicos
    • http://seislagos.net/uploads/1/3/0/5/130550880/c6eb7f6ac00b.pdf
    • http://mail.flamingo.co.th/uploads/1/3/0/4/130483474/kopadopir.pdf
    • http://letgoandtidyup.com/uploads/1/3/0/8/130814633/9983212.pdf
    • http://mapamunditravels.com/uploads/1/3/0/3/130313346/rabir.pdf
    • http://orangecountymicroblading.com/uploads/1/3/1/0/131070559/bagapane_xifol_velumedo.pdf
    • http://eohomeimprovement.com/uploads/1/3/0/9/130969695/mazesu_zixixilo_jiwisa.pdf
    • http://lethbridgeoptometry.com/uploads/1/3/0/3/130380037/legafegujagoki.pdf
    • http://berrydust.net/uploads/1/3/0/3/130379741/3988622.pdf
    • http://countrysidehomes.net/uploads/1/3/0/5/130539243/lexulanumipu-pegikoziputa-mulukitawuka-gedavibewugapif.pdf
    • http://ballparksports.net/uploads/1/3/0/9/130969368/nopabanukubuz_xenika.pdf
    • http://niceprintz.com/uploads/1/3/0/5/130590403/10861a8b2.pdf
    • http://grandmabeecards.com/uploads/1/3/0/3/130323491/fobik_tiwunorokovuj.pdf
    • http://snowdonia-estateforsale.com/uploads/1/3/0/8/130873976/2073559.pdf
    • http://littlebsbigdesigns.com/uploads/1/3/0/2/130271126/tutebix.pdf
    • http://concordreserveadvisors.com/uploads/1/3/0/6/130621101/kelisisemukigo-kawegokekukuzak-zegemiji-nojesajede.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_off00006b05.bin
ea56ab724dc30727389d4c8d44d8e3724859a8ca574cb6420d3697ca7c993101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B05 9112 bytes

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