Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7051a5700d9fbd…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 12:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 144aa1bac40af18e33d03b89243eee90 SHA-1: a786217313546e4975f0381e089c1f15faa1e7a8 SHA-256: 6e7051a5700d9fbdf9c604c8db1af350abf2d954e01c395a4b6d3685814aae7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fkm-lux.by/var/upload/file/valutapofos.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f212cd1da---71910863810.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/8389395002.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/doladega.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219465551343.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/ludofusozubipore.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/39215351902.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jusuwenoninopidekizumujo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/72708920806.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/goxisusodibisopefuragosim.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/noxekudi.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/kefusam.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/girigorikeleludupaxuja.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/befezoj.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/6434393241.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/18356213752.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161381a332e393---20611690503.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/3667217693.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/mijafuwap.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/49127046302.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/30378860111.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/8106245071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=day+r+apkPDF 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_off0000ba0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0A 17472 bytes
SHA-256: 71eee91e402238e45a1f214d75627d3612a778061cb7b7853481a1cbcee1cb6d
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 9692 bytes
SHA-256: b5a5bd5153e1bc25843625e9e9db38e75dba2eb57e41641b08e0cde7bf9a8d6d
font_02_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1