Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ca19d89c0640e2…

MALICIOUS

PDF

65.9 KB Created: 2021-03-29 23:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0edf45aac95f071cf99c2a8baeda3133 SHA-1: 88db58d5b4da784852c78f9b1ce067196a5b1ec7 SHA-256: 77ca19d89c0640e20f656d3e26ccff9902f797e2e1c50590422312d2e490c607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to disposable hosting services, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit vulnerabilities or trick users into downloading further payloads.

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://seumenha.ru/wix?keyword=2014+audi+s5+manual+for+sale PDF link annotation
    • https://lijiwowotu.weebly.com/uploads/1/3/4/5/134587055/7755820.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/4ghMSii/ethiopian_airlines_cargo_fire.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/hfcigmx/98814906787.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/2d3364c8.pdfIn PDF document text
    • http://linza.media/inclusive_early_childhood_education_bookkrhqx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_6039d50b1fd4a.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/cdhagzS/parevarinuzebedolus.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/nb3rdVb/77710971393.pdfIn PDF document text
    • http://esplus.pro/20672589765e22aq.pdfIn PDF document text
    • http://thedouche.xyz/loan_officer_business_plan_templateznat2.pdfIn PDF document text
    • https://cdn.sqhk.co/vibugilek/WJifphe/7307015350.pdfIn PDF document text
    • https://cdn.sqhk.co/bugokasite/aejjVYC/thermal_insulation_sheet_nz.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/5643143.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/LhgXnje/karigova.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/24519a25e8008b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_6009ed244188a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 5496 bytes
SHA-256: da354db4bf75ed0139df909bbb4f3199808eb4757657788a6cb891d18878f41a
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 10184 bytes
SHA-256: 0550b3d68881d52fb06fa337c8ca0896f7f17187b42602e61c877054f81efb57

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