Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4abe8ab7eb715c2…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 03:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4a59511b8d84c4b6e144a091294a4f SHA-1: 3b015648dff0972312cda6395924aee9234c3f9b SHA-256: d4abe8ab7eb715c25e94c4f70a01bffbe3978fa7389bf9cb497e9c735698a648
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware delivery attempt. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.algeos.com/js/ckfinder/userfiles/files/44124869939.pdf
    • https://acryl-bg.com/userfiles/file/81686257171.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/wurel.pdf
    • http://patp1ryb.ru/media/file/17724707323.pdf
    • http://lamardaegu.com/upfile/user/file/bewasoximes.pdf
    • https://iqrainternationalschool.org/_assets/files/dujikoreda.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/70960686927.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/14960968788.pdf
    • http://ecogestval.com/userfiles/file/25677900827.pdf
    • http://savytrading.com/userfiles/file/sidijalopexipakajamuzulud.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/76410581228.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161523735b1709---97210556133.pdf
    • http://www.serge-valentin.net/ckfinder/userfiles/files/gabinepazo.pdf
    • http://deaprogettazioni.it/userfiles/files/ralon.pdf
    • http://sun-tes.ru/files/file/muminelumoxefitigurudab.pdf
    • https://sowlindia.com/userfiles/file/50738527658.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151e23d18b58---nigaraguxis.pdf
    • https://pgp-puh.hr/fck_media/file/3792280940.pdf
    • http://www.awakohchang.com/image/upload/File/ogarumirar.pdf
    • https://cyc-catering.pe/disac/userfiles/file/958323936.pdf
    • http://brandorbit.in/userfiles/file/dipelivomesezegi.pdf
    • https://pisangmanis.com/contents/files/tububo.pdf
    • http://gerd-pollak.de/userfiles/file/90177317926.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/goxuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fortnite+for+free+on+android
    • 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_off0000aea8.bin
95f93f93cfda0c7dd4bb5bd2a4d560ded73a2137972ceba0dcf801b8dd4606ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA8 15736 bytes
font_01_sfnt_off0000d664.bin
05aedefc4bd83d469b4fb1a83460f52b82814c4d356168801fe049b03ecd4b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 10112 bytes
font_02_sfnt_off0000ed07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16792 bytes

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