Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55bd78574f39d07…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 19:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aded169b7ed38c2600f70dbe3a7c0db SHA-1: 5c471341cb6c2f5408f1cebe08d5f52a869e3ab2 SHA-256: b55bd78574f39d0780341f48e6fa01e5cecd9672ec97be531f358e48ff54ba2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. This behavior is indicative of a link farm designed to host and distribute malicious payloads, likely through a phishing campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://freehajjandumrah.com/admin/admin/uploadfiles/file/kevejavumifi.pdf In PDF document text
    • https://hatinhjobs.com/upload/files/42769580935.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908135629533431.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/50834293221.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/66073799697.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/91920167638.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/zovoxojemodewizesiliziva.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/26384652696.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/46471285688.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/30612225690.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330ce2c1c2c---maruzuwufigukotusirejik.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a17e8f241---41118259226.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/91800925422.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/87365618086.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/gumupekater.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/54645299793.pdfIn PDF document text
    • https://eniedu.com/data/file/20210907175215.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rebobawoxobabekaku.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/61394618159.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/lukolinagazudeviserad.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/rulodutosa.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/wemedibimogusowokibiwug.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/zovezoxosuladaduwuzev.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/wewadujeranusivunadag.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/65967761216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=baadshaho+full+hd+moviePDF 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 18316 bytes
SHA-256: 787ff5292b3388e5f944308c184180acc992e642a2298e72d60109f7dc223f31
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10536 bytes
SHA-256: b7b72398c830e62148095c0b11c7b62dcf5c0de43523761c1448d50ce1b3b55c
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1