Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaeb90443c5de1d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 01:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10f5123e25d227e787a256044b3bb04b SHA-1: 663613156a9ef52ef0c3ad4085140b8e4215b30f SHA-256: adaeb90443c5de1d51bb7ddd411cbbf830cdc3053aaf9d4c491141705307b7f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to potentially disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kaushalacademy.org/ckfinder/userfiles/files/59594510602.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b89d765806e9b46bc9e7d08f7a8ef537/jekolulepewajubitaram.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/91232263395.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/refaferunolo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/71917331815.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16145d80e27fc3---dixotoneselikizawobipivam.pdfIn PDF document text
    • http://186086.com/upload/files/xitetegadojaxiwov.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/31426176282.pdfIn PDF document text
    • http://webbuilders.com/files/file/93172011455.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/31761892864.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/76522140001.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109121649091134.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/mawonatibobamakovabelin.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/9205754989.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/96791120617.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_8940D0FEFE2CD7C6.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/bawonetosewimafazekorom.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/73290114814.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/50574150714.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/3276102591.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/14/fekite.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kulimij.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/xawonidonuvip.pdfIn PDF document text
    • http://sb-78.ru/files/file/58263773929.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/69405783475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+way+to+record+calls+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 10616 bytes
SHA-256: 01ce8a089b7f544fe2afd81a9462b32663c40ed5be23f0b725ec1b8fb4ba9f04
font_01_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 16948 bytes
SHA-256: 08af5c1733c8851623c7821046c1720a1bf3f04229129775e07b0dee0103441d
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1