Malicious PDF — malware analysis report

Static analysis result for SHA-256 4887d8594475dc82…

MALICIOUS

PDF

68.2 KB Created: 2021-09-15 20:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 898a57a9c74c87c40873d48f7b5bb82f SHA-1: 103e236f2239c9afe1b4f57082412e11cc6c8563 SHA-256: 4887d8594475dc82ad119b005d6b9d80d7bf14e664fd704609c4993ff6014b63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, including a link farm heuristic, suggests an attempt to redirect users to malicious websites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://songhandiban.com/uploadfile/file/2021091411293873499.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/50354436025.pdf
    • https://sambelteri.com/contents/files/biwobopepuzalo.pdf
    • http://podiummoda.ru/userfiles/file/pupixanezaratumabi.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/32027597584.pdf
    • https://polaria.cz/images/file/59710826389.pdf
    • http://cana.vn/uploads/userfiles/file/60013119210.pdf
    • https://cuatudongsaigon.net/uploads/files/mikiruremav.pdf
    • https://amursvoidom.ru/media/files/45412523520.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5a80b533---83705430210.pdf
    • http://expresskaliski.info/file/sewova.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81de91fb8---zajeguwowifesejilatabega.pdf
    • http://newmob.it/userfiles/files/72044000486.pdf
    • http://grafiport.com/userfiles/file/64458939914.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/54355259928.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/turofubedenuw.pdf
    • http://candybeauty.vn/upload/files/50250858116.pdf
    • http://rfinshaat.az/userfiles/file/zodupisaduwatedewiwomi.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kufomivuronoxik.pdf
    • http://bluelakehomestay.com/uploads/image/files/99498546015.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/65855117575.pdf
    • http://www.reeder.ee/files/filemanager/33690398034.pdf
    • http://drxzhang.com/userfiles/file/56937354401.pdf
    • http://skia22.ru/pic/file/xopinawomipamojefokovono.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=messenger+download+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_off0000b04f.bin
c555009a2290914b1b13a3c25318485802df057f4c9bf64035a3840dfb1fd42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04F 10404 bytes
font_01_sfnt_off0000c7cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CC 16792 bytes
font_02_sfnt_off0000dfde.bin
f93114f907bde29c88ae224975e6d8821165f8d81f9a3c83603713bc3ec0ec06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 14328 bytes

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