Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf2b1cc521ae101…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 04:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c85d7e8432691fcc90e896b1684934a5 SHA-1: 64d5a7f1d44d5d78d51f4a761d728f10f8819b68 SHA-256: faf2b1cc521ae1013fe42804852100cc2e880b33388c5fd17c29bc92c9a7edd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. This strongly suggests a phishing or malware distribution attempt, leveraging the numerous links to obscure the true malicious destination. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laborke.ru/uplcv?utm_term=redmi+note+8+android+version PDF link annotation
    • https://beeshark.ro/app/webroot/files/userfiles/files/wurel.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/13182522640.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/8427961478.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/6492212034.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/niriranuvoxegilewivireza.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/58546226435.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091321491773499.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/21290012397.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/7971048279.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/67374494912.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/85168323678.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/vekijabinute.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904161523.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/80324674028.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/bizebazifusoboloxokel.pdfIn PDF document text
    • https://network-italia.it/file/japezanodosujivuxunuj.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/xupun.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210901/file/16304557763358.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ded389ae---dajajojuvuxixasujose.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/63076859110.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/visezudafukapirolanas.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/81069005513.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9c18ca6acd4a547a273af9e8adad5413/99214289020.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xafitufot.pdfIn PDF document text
    • http://digifast.cz/userfiles/87493298558.pdfIn PDF document text
    • 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 10680 bytes
SHA-256: 4d2e8f4705260e9b8dde59395f0960349172553fd881dd6110cbc7c46ecd7bd3
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 17236 bytes
SHA-256: 2db7f66c77f17b341dcd3707c49903c831c99ca37c0346a2bed9e3cd762c7817
font_02_sfnt_off00011f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1