Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3becbf246a6d8a6…

MALICIOUS

PDF

94.3 KB Created: 2021-09-19 23:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7f84b40d7b4bba29ac7da6d0f77e988 SHA-1: ac0fd2c0d1d6ac8759e72cd109f43f2262f8670e SHA-256: b3becbf246a6d8a69c85b166f64f7e4a811ae9c3f5fb559430ba6eb7d0bcf881
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs pointing to various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm intended to obscure malicious activity. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=bridge+constructor+full+apk
    • http://mirutte.com/newsfiles/files/fuxozosagozokut.pdf
    • http://immobilieninvestors.com/userfiles/file/xaxepejox.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/92867947944.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d6bd731c1---tuzozosutaganitawumul.pdf
    • http://lamelove-zakryti.cz/userfiles/file/94466815382.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/93953554469.pdf
    • http://heorungminhphat.com/luutru/files/lunolapekadukexojiduk.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/91085941310.pdf
    • https://md-bud.pl/szklo/photos/file/54556082257.pdf
    • http://brunagabriele.it/userfiles/files/9842245596.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbeed8f22---vagojiwomawugaxu.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/xifidimedagesawebi.pdf
    • http://oprandi.it/userfiles/files/98438302264.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6b5b4568---jofenerotexekixopezeto.pdf
    • http://khlongtoei-nfe.com/library/userfiles/file/6274240025.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nurojoxisuvoremupilira.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/82935688173.pdf
    • http://synfarm.com/upload/files/71020408161.pdf
    • http://rasmesafar.net/basefile/basefiles/99477668850.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vogosuveladege.pdf
    • http://retco.ge/ckfinder/userfiles/files/nevapedogabili.pdf
    • http://targhevaticane.it/userfiles/files/88536248848.pdf
    • http://uticachemical.com/files/upload/files/fumubikapegelutop.pdf
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/tipopanaduk.pdf
    • https://harkakotony.hu/UserFiles/file/86696265763.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://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_off00010939.bin
7439200dadff30c0867d2a7ec1172b8524c9c64d925053e63b72bc905a0da8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 18340 bytes
font_01_sfnt_off0001398b.bin
67bde2fe27a76dbb6b42d72f14e21b00475e2916b99c13744db4227b0ceca86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 11040 bytes
font_02_sfnt_off00015330.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 16792 bytes

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