Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e8b59b38fba558…

MALICIOUS

PDF

85.1 KB Created: 2021-10-07 03:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c46e0e528de6332bd734ae3b1e669765 SHA-1: 32b510e258fa2b28d00c552188f83ecb9e92b91d SHA-256: a1e8b59b38fba558f5ce26bc8e51c26e833f86bb520d22fe5cd6fc3a918032a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's part of a link farm on disposable domains. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution scheme. The document body was unreadable, but the overall structure and URL analysis suggest a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://rubivina.com/Images_upload/files/90886102808.pdf In PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/78922359527.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/rakevipatofokebadijolukep.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/nunamegasusufa.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/wudomibasinupapejakaw.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/tuwana.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/vedam.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/34705247479.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/71158748089.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/72394551442.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/35106388486.pdfIn PDF document text
    • http://saktigroup.in/uploads/dajibexigigikaxa.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/29112120026.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vilup.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/27599204823.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff2c816ae---2473799545.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/bonagawivavepilejad.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-15/20210915185757898585.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/27805928478.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161514eb1daa58---88536825588.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/50664959128.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/pabezujunodetotip.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/69839342324.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/34880398143.pdfIn PDF document text
    • http://saktigroup.in/uploads/limizozigemuwufifatozer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+translate+pdf+file+into+englishPDF 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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 19236 bytes
SHA-256: 3fa415c29c9d348fdab79069b03db228f1f7d9d0a2d29ecbc49b2a9188db8216
font_02_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 10856 bytes
SHA-256: f87e5e0c5f98a1ec26b3c098b2f3e7b5a0d35a2654e34a989bdfc2d37ddb9e49