Malicious PDF — malware analysis report

Static analysis result for SHA-256 de30b44580d6b218…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 01:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9f32d62cd006acdd36f45a671b72e944 SHA-1: 4b070b5d01d1b191974f746b1c668094dda0f94f SHA-256: de30b44580d6b2185d863a0c41e5d5418538c2bc7fa8f054482dde76e5244908
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://kuzutuzo.ru/wb?keyword=merit%20badge%20book%20personal%20fitness PDF link annotation
    • https://cdn.sqhk.co/jawuraxexije/OQ9gehd/50067849820.pdfIn PDF document text
    • http://foguwefo.iblogger.org/alguien_esta_mintiendo_google_drive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_6016cbb7ebb24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_6011d23a4a2f7.pdfIn PDF document text
    • http://xigotev.iblogger.org/paulo_coelho_brida_italiano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fff6fd584df5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_60099ef7cb114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5fec167c21a2c.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/EzgzYgj/4694461373.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/Zgdhbgh/push_payment_vs_pull_payment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojolapona.rf.gd/benevogivupugivota.pdfIn PDF document text
    • http://nununad.myartsonline.com/stattraktm_m249_spectre_field-tested.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/prometeo_encadenado_biblioteca_virtual_universal.pdfIn PDF document text
    • http://gonoluripep.rf.gd/dejakefekutumixoze.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 5420 bytes
SHA-256: 31146376622f1c099ae15e945f2dc41712494fd1b400eb5756b6b8bc63437b4e
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10880 bytes
SHA-256: 3eec430c2f3d0ed72a686760ff26f087082007798202a2424c78edd1a4a6b010

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