Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3349056fc1c2de…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 14:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e603448ca5d72b5ceded6dfc81745fd SHA-1: e684f2aebe3e990206fa43b773f55ec3d35d4f5f SHA-256: ab3349056fc1c2dee029f184ce07d2d5d2b186d1b8fbefb2c2d16012251d3894
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362aebd9520---66420725340.pdf
    • http://globalfeedindustry.com/upload/files/74093942170.pdf
    • http://iraneto.com/basefile/iranetocom/files/numox.pdf
    • http://healingtown.org/userData/board/file/1540360704.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kejibegojevuritegekevep.pdf
    • http://tiszaladany.hu/upload/file/nizijizegonewako.pdf
    • http://gorod-r.com/userfiles/file/61696373507.pdf
    • http://woodbridgeabw.com/uploads/files/dagufuramiroremotesenuwil.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/63014521939.pdf
    • http://malifer.hu/upload/file/kilage.pdf
    • http://beijingxinzhi.com/userfiles/file/20210901071430_1336696146.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/mamazegu.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/2972598833.pdf
    • http://seasonmediagroup.com/pic/file/82582022506.pdf
    • http://mnarch.it/userfiles/files/mutaxolugivaxavirejofawil.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613271f0c9641---kipagudikuwopuk.pdf
    • http://geteffective.biz/uploadfiles/file/dibigowowukuruvives.pdf
    • http://sinsg.com/files/fckeditor/file/foporixuzudutone.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/tivifagebizame.pdf
    • http://dentish.ru/ckfinder/userfiles/files/74228518413.pdf
    • http://classiccar-jp.com/js/upload/files/55973485652.pdf
    • https://anhhuynoithat.com/asset/files/mikupazomaniwomowiloma.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=honda+pilot+2016+manual
    • 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://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_off0000ccab.bin
5e1b53f94e984836209867846f7734df15f540d60b8205106a0c66d84ab45c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 17036 bytes
font_01_sfnt_off0000f889.bin
3d9489232806fa45c54d512fb0cbaf5011eb6b62521ab0592b52b7928b651be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 10704 bytes
font_02_sfnt_off00011110.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 16792 bytes

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