Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74a7a4bb64c204a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 05:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91196163880ebebc59019d7b394cecea SHA-1: ea47b7205c83d470035fed4992b7587c3d4a567d SHA-256: d74a7a4bb64c204a21188dfede622041dbe58e29abf4e4349093051b56e872e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many hosted on potentially disposable domains, suggests a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613e049ca1aed---37224656662.pdf In PDF document text
    • http://sergeybazarov.ru/file/51032357059.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/8019516442.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/52740118724.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/87549514547.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/95361803236.pdfIn PDF document text
    • https://negaratoto.com/contents/files/80227720308.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69475977871.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/terisifawewo.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/38989822968.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/josapakefobu.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/bexuxavosanorogimizatej.pdfIn PDF document text
    • https://kimcert.com/E/file/76744903183.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/ranifojifalozitejularifez.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/99436594648.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/47197473259.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/fagogixuxiguvotasifusub.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/25554753337.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/32911530113.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/risofakimevujeg.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/60712975096.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/07051909470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=malayalam+typing+software+for+android+mobilePDF 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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 11176 bytes
SHA-256: fcb69e7bc3acb90a1af6153e223e3d072209c8b6db7e21daeedf6b446f2994ca
font_02_sfnt_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 17236 bytes
SHA-256: e393ec6a46739f95a6f26ddca618840f3e4078088b46a0d9c837a72ba80f9d45

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