Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd3fc4621a80f47…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 18:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3188ae34ca2c25b30bd9f83e69c2343c SHA-1: 8605f1cf87f307efaf2d7d7b092c72206d930f9b SHA-256: 1cd3fc4621a80f4707f0e520d83837a03d4d00c8f25199ca04f8eca8ecd87373
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 disposable domains, indicating a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/wix?keyword=justine+elizabeth+instagram PDF link annotation
    • http://keysecret.ru/what_stores_carry_invicta_watchesa9xj9.pdfIn PDF document text
    • http://disconto50.info/braava_jet_m6_vs_roborock_s5_maxf6ld9.pdfIn PDF document text
    • http://bathforlegs.xyz/tevogotinuwz6vrv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5fed029486103.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/9SOJQPe/jcc_smart_payments_cablenet.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/jiEhche/46597986432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_6034c56598249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_603f455923556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fe5315f0ff2d.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/gjEW7hg/46456015488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5fda55ecb1583.pdfIn PDF document text
    • https://cdn.sqhk.co/janimivaxo/cMvgcf7/how_to_create_checklist_template_in_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_60047e68bfb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_603bcfcdbca2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_6044a04aee213.pdfIn PDF document text
    • http://marketeuro.pro/82274449566lwvut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_ada73d10851d466da0dca759531dff56.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_c23600762a6640ec86770ca2f02ecf60.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_4a4cf797266c44e28f670e7efd3f2c3f.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_188c709aa3264c3c9499ad3c7ad21394.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_8aac6463dafb4757b0da75869bb69c32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/178753a7-5e41-425a-8c14-535be235e8c5/m_audio_firewire_410_driver_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe18822-89b7-49b3-8161-78cfb30f0397/army_white_paper_regulation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11e95ff-d45c-4e90-a47e-1bcb54447987/55912196343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f1e1d0-a711-4907-8cf8-68b7badc3e81/xaxanidate.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
    • 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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 5276 bytes
SHA-256: 59208094641f0728e0b4b10d3fad2983970a703d3ef14bd02a0fbefbf875a694
font_01_sfnt_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 12040 bytes
SHA-256: 4b8500874847f213d12655e3527e3fcafcfb7356d071f940b1dac2f340d92dc4
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 16544 bytes
SHA-256: 49230a07578f2a0b108554ff1d47b1cb24b8f8081254bad551c0ce72ea05e0a5

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