Malicious PDF — malware analysis report

Static analysis result for SHA-256 c581d9d8306d3f6b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bfdbb4e79702ed2148039fd3e7f3fb4 SHA-1: 3b3e67ef82fa1c0da0f3ffe1817248a53a4c4661 SHA-256: c581d9d8306d3f6bda06ef0a88127e2dfe83c2479ac6965aeb5ab2a62605c47f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hansungidschool.com/userfiles/file/sinavimevewawilawuk.pdf In PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/vunit.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/lewukagemop.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/pageberovuto.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d156ea77bf---volodivodapev.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/duzibuxone.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/zavadirijuletikixuvolexi.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/55876187728.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/52478954849.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/58373965454.pdfIn PDF document text
    • http://secoinblock.com/upload/files/domezizibagonixejuvi.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/gefukurexi.pdfIn PDF document text
    • http://bushurov.ru/images/files/94344333051.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/99305578780.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210905102846.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/sumin.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/faboz.pdfIn PDF document text
    • http://full814.com/upload/files/76287172362.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/piberabepolota.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/75917472213.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u1tiadm66bps7urp3vlog5eej9/26784611852.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/nuxaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=3.5+trillion+in+numbersPDF 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 17892 bytes
SHA-256: afd81f78a354f58b9ab9cc0eb56355af427252547c8ccb991d5f8fef9b20015e
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 10624 bytes
SHA-256: b088e8b2c7a74e5e932982db9d46202b9bc4bb4c82f843e92533eac892da4568

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