Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f78ba703f06104…

MALICIOUS

PDF

66.1 KB Created: 2020-12-13 14:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f4304156f2e8b4166cf24de54fd68045 SHA-1: d7e4c8752f68eb103cd6bf2a3e518311866be6f6 SHA-256: a3f78ba703f06104099f3d3d3469daa60964ef763e76b39b5d31ea5c158cbbb8
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/strik?utm_term=eve+online+races+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8acc8981315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5fb42321ef88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f979bb3f3a70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8b2d1c27651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/786fa4c1-a66c-4c9e-88f7-d241566474d7/9184768370.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/angamaly_diaries_full_movie_free_cinemavilla.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/nexus_alternate_start_infinite_answer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e464ab79f442f229936f/t/5fc1d5f01972c46e3ce1e2fd/1606538739848/lesson_9_vocabulary_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4f8ee085bf90c0e173f98/t/5fc93aea02d37e01647c0c9f/1607023339155/knights_fight_medieval_arena_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc105f69955c744b53c3d2c/t/5fc51a301972c46e3c40153e/1606752817577/algebra_1_chapter_5_standardized_test_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b7185e8e827d42938bac/t/5fc55702f8cdb769c69522a0/1606768389674/39930287554.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d26f8cdb769c6d919da/1606372646658/97692274147.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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 5124 bytes
SHA-256: 49ad99ddcf9668a01ed6c43de819a5b5f0f6d9eaa7e41a62bd99f2671fc3b515
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 10588 bytes
SHA-256: a5e28e9c0610f81731af64e96ba0c8c1d80cd00ed410f13f4e5e90b131ca82b8

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