Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97ef371940b2911…

MALICIOUS

PDF

90.5 KB Created: 2021-09-18 20:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1ad6263e8ebafb9da95d591699ed545 SHA-1: ed1570e166ac9cca022f7a0714e1cdcb95f61085 SHA-256: e97ef371940b2911decc38ac5869db6cc5bfb1d86eddb131213695033be24e13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50f1401e7---2386331057.pdf
    • https://maintogelonline.info/contents/files/28824074374.pdf
    • https://worldpigment.com/image/upload/File/11552898587.pdf
    • http://sambometal.com/dataroom/file/reregavapufakiwitukuxawe.pdf
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/vikuvulejitazet.pdf
    • http://myphamvickwhitebeck.vn/luutru/files/tusuwurubibo.pdf
    • http://irinaburmistrova.ru/files/68139137665.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8483f486c19927e66f64bec053f940ea/88741603344.pdf
    • http://elementyzlaczne.pl/media/file/pejeti.pdf
    • http://iehyun.com/editorupload/file/tazib.pdf
    • http://merwepizza.com/upload/file/jogokubamelipuvitap.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/vuvitejafasiwebogibuxawam.pdf
    • http://custom-mugs-factory.com/uploadfile/files/59880224371.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jamewibutaxala.pdf
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_3E5D62DD9F4FF8D2.pdf
    • http://eastcity.hu/ufiles/file/jedazogaxomev.pdf
    • https://aonetreks.com/uploads/file/12311409898.pdf
    • https://immo-macedo.lu/userfiles/files/vixuperuzuwuwapelum.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/vijupuvuvisesagudefid.pdf
    • https://mps-india.com/userfiles/files/4636679632.pdf
    • http://a1-automotivegroup.com/upload/files/65633574435.pdf
    • http://domesticsolutionsagency.com/userfiles/file/xoxezokituvigununogale.pdf
    • http://flapboxes.com/userfiles/files/67053152993.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bluetooth+keeps+disconnecting+from+car+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_off0000f993.bin
5e17cee0ddc8083621095fe8289169a837ca9508c2a77dc1db365258e149b225		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 18596 bytes
font_01_sfnt_off000129f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 16792 bytes
font_02_sfnt_off0001420f.bin
44fc8b83d43db545567dd976dc654461ceca86ebb5238e7f21a1529fbd715ed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1420F 11312 bytes

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