Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7295bcc43dafbb…

MALICIOUS

PDF

81.0 KB Created: 2021-10-10 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ade1ff431ecfbc6dbdaf93c1446c969c SHA-1: 26186fb20ebd6510da24f539521905ce6740d5ad SHA-256: de7295bcc43dafbb0eed8efc4e918b5822a170c67ea73c9a675d89fb7562ec0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=decanter+in+a+sentence PDF link annotation
    • http://bensonlandscape.com/editorData/file/19705656956.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/sukamesu.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/12858987841.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/weteveki.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/734a5ba514b7143c686004efcaf2161a/jitififubukaxuketip.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/14616478540.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/dapogojo.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/60821126382.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/pamazodokokuvopek.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/tovebesimamow.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/zapedu.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/lolububu.pdfIn PDF document text
    • https://2acontractor.it/images/file/43938823432.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/40688202446.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/movasosepuxipenozibex.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/57718393800.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/jabotudidosiru.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/fugipiveposixe.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/zapisalenovabozetit.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/tuvenafegasuni.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/53902977882.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/wejudexofunulerilugelava.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/sitoxakasuvasez.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/72985743052.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/68147383474.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 10056 bytes
SHA-256: a1a98d503e50e8168469861f0fc3161139325a6824276529ab19f04d1e19b16f
font_01_sfnt_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 18564 bytes
SHA-256: 1279a38f5d65b29e4a2af7b7ff100bff2920662b98db3e97ee1b30db400b9918