Malicious PDF — malware analysis report

Static analysis result for SHA-256 4070780e3eeec57f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 21:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6dedd4965745d75669646b16a3159244 SHA-1: e2b47e1081e9708b313065d514a81ea9c3e0fb02 SHA-256: 4070780e3eeec57f491fede20c32282d5a93ca22c956ce034536a4e73d2bd0ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files, suggests a link farm or redirection mechanism designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://de.ruben.pl/ckfinder/userfiles/files/10028556196.pdf In PDF document text
    • http://galenbio.com/images/upload/file/fosagupovilusujuguremolut.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pogureboburos.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/gupefes.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/wilakiwiluzi.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/77043169797.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/3961554183.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/71155540089.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/subepesededi.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/tuduv.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/zewabakiru.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/55163987020.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/40372523690.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/lotafige.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/10949100660.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/tajapasegakogebunedeb.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/komevasinewomuveku.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/jawifidavaxo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/39510796153.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8a2cb29d---2917357705.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a702a2da97---41711663430.pdfIn PDF document text
    • https://rosycaffe.com/file/volifavulisowakogav.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908145221439120.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/botulufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+icons+and+their+meaningsPDF 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 10752 bytes
SHA-256: 3c75989e4fb0b074af7caeb7c64f1e1ec4a69c3cdbdf058b53668f2c1d809357
font_01_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 17232 bytes
SHA-256: 5f9142954cf4391c564d46532274f2a7c432aff1a9b32e9abdf7ec12d13ab315
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1