Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cd631f2bbfdc0b…

MALICIOUS

PDF

93.9 KB Created: 2021-09-14 12:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 582f22caa674665a3ef817b5d09fc4b5 SHA-1: 4682d06402bc7c41b6d78267b95b47aca9125015 SHA-256: 63cd631f2bbfdc0b222a6334d9149e7abb7ab1241742725bafe9d68d107a47f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=harry+potter+all+book+pdf PDF link annotation
    • http://www.binghan.my/userfiles/file/varegorudidiruvavi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7de47f1e2---winiruzavovabijadogax.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/tuxaraxevifusu.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/pabuta.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/30619183402.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/42855627340.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/37351193891.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/51194241475.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c4b6cbc094290f11a1738d794a36fa6b/96012823363.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/jomur.pdfIn PDF document text
    • http://taociren.com/upload/file/21091014375566412734jkpo3n1esf.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/33954797705.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/16859418096.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/pibovuzosilamowatijopir.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/robizelaraperi.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/3005024874.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/27250589555.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/lajawavadalurifo.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/xiwufuzonubanamenafololol.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/66610665566.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/ditevida.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/56404263011.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/32525629430.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/70428808050.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/28370876899.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/ladulobagi.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_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 10464 bytes
SHA-256: 082868ce7d6cea190b9bd50247ce8c9333574fdc91e8f79ae4ef7b3069d01fb2
font_02_sfnt_off0001383f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383F 19344 bytes
SHA-256: 9209806ddd9910187524ef3e5085c35cb389806b339d8bad16bc4cb6e91db48d