Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d661bbf78fb640e…

MALICIOUS

PDF

75.8 KB Created: 2021-10-01 12:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f330ad3a7634576af8288ecf514b5545 SHA-1: ec854a4011cb26617a1e336d508cc68f1ffc966d SHA-256: 0d661bbf78fb640e434887a12b820a6f67c6c40274c08c5a6b078d4cd0ed4926
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://descanso.verareyes.com/ckfinder/userfiles/files/51976699082.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148c12a6991e---56708299167.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/9708046179.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/dowij.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/38512235268.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210903200024.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131889c6b2d7---53324185189.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xofufotitotegimujibenoxos.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/22216157640.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/jekonitugu.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/91239279200.pdfIn PDF document text
    • http://ijfbn.com/editor_up/10227432129.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/wirevosumusoleferanexejam.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/zatuwonojomet.pdfIn PDF document text
    • https://sapporopools.com/contents/files/ravejusegiwuxodotuj.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/15161684739.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vebubivopigetuwokuzer.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/44818541872.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/82323991429.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/fixovetidapogib.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/lomelabaru.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/50028128666.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/4886646404.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/kazapuxalo.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/wawirilafuxufolanukugevam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=save+data+ppssppPDF 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_off0000be11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE11 10064 bytes
SHA-256: 6c0cb293d778c622c217d0f889f7e23fd3e71b45e83faafa5025353f881708d2
font_01_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 20156 bytes
SHA-256: 6e2cd9ce79d8a27988c03f1cbb676746f103a547e02171f4cca44fb7e23feb7f
font_02_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1