Malicious PDF — malware analysis report

Static analysis result for SHA-256 8855706b4fe22ecd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 15:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a2da74f8dc4b745679cc2d37e6960f3 SHA-1: 0a54afc5fe4fd7aaec0b3f6b03e7a38197b22433 SHA-256: 8855706b4fe22ecdb97c57c71b4f655e17cf96897c868bb2aa104d1bf0aeaf30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or link-farming domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely for downloading further payloads or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://vannordenvastgoed.nl/userfiles/file/66161632552.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1631692833.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a37d19fa---58317437594.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/notafateranunudixuzo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/wavirejivokoxe.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/pupitujegajopawun.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/puwetozoziveki.pdfIn PDF document text
    • http://e-sheremet.com/img/zegekaroroloregudi.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/26518953678.pdfIn PDF document text
    • http://fourfoods.com/images/files/13685846631.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/48273364968.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/35354040679.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wexuzimijolazesufabu.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/doxesurupiridisejofumex.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/bupirujulidodefizujim.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906065702.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/90640135825.pdfIn PDF document text
    • https://theurbanthinktank.com/files/paxofofeji.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/netisudujabekisesaxijovaw.pdfIn PDF document text
    • https://km2804.com/ckupload/files/59589659944.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/varevefezimu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82bbcc4a7---ledogagejizonutogup.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/18317926363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=house+md+season+1+watch+onlinePDF 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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 17080 bytes
SHA-256: bbb64a8afe4ee654f9d08b2fa7dab8deafef995ec1332cd03499910ca5bb8477
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 10764 bytes
SHA-256: 60fb9adc434e28acb1510cd705a2afa24235658ce90e116e16f7eb83ec177ffa