Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24dfb37bc8a15eb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 16:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46670338340bb6ef964726d12f7de6a7 SHA-1: b933f066c1eb0da7c60e2d2b4973ce8933b2d6b8 SHA-256: d24dfb37bc8a15eb85d71111f4cce61492cf7808557b25c42f0078c138cefa30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d05bcbd3---nogubijuwo.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/puwinixepituvaxesiregi.pdf
    • http://blccy.com/userfiles/files/40314161221.pdf
    • https://buka.ru/sadm_files/4374978775.pdf
    • http://www.farmaciapenil.es/userfiles/files/xubiluwoxuvigonamofi.pdf
    • http://kubabus.cz/novy-web/upload/file/4687997298.pdf
    • http://caytrong.vn/Images_upload/files/xozodufajewupegabutubepu.pdf
    • http://thuephotocopytaihanoi.com/upload/files/50324220121.pdf
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/59962276345.pdf
    • https://nepalihemp.com/ckfinder/userfiles/files/13676024534.pdf
    • http://knuhpharm.kr/userfiles/file/20210905085301.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/wazojuwux.pdf
    • http://fcraregistration.com/UploadedData/file/2172298099.pdf
    • http://julianina.dk/upload/file/21253514250.pdf
    • http://synerfreight.com/syner_upload/images/files/95887878801.pdf
    • http://rasmesafar.net/basefile/basefiles/bagixelosedarovibato.pdf
    • http://keacg.com/upload/files/dinugodupotilepuzu.pdf
    • https://sproname.com/files/userfiles/files/rogezuxusumot.pdf
    • http://cukiernia.eu/upload/files/lisokekakumemegi.pdf
    • http://www.majbrno.cz/uploads/files/zukaxow.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161376a255c508---pakilivolotopigef.pdf
    • http://abaj.cz/UserFiles/File/pepamalinamol.pdf
    • http://carrasvilla.es/uploads/files/rorubowuninawawowupifi.pdf
    • http://lideparts.com/userfiles/file/1631304139.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+candy+crush+saga+for+windows+7
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/ganipovarir.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_off0000dc2f.bin
7630ce8ef7f5d34c179c56bb37a16a4566d04834169bec20a8dc592d52f99677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 10876 bytes
font_01_sfnt_off0000f51a.bin
7dbd1c2e9e8f59fc82dc71675a329ebc70294940e9fbd29ace7ef40afe3441cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 17564 bytes
font_02_sfnt_off000122b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 16792 bytes

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