Malicious PDF — malware analysis report

Static analysis result for SHA-256 944c750fd11d7cfe…

MALICIOUS

PDF

98.8 KB Created: 2020-11-20 07:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c341435e2a4a9cc52cda4adc2f5bcce8 SHA-1: 98660a46cc94e68dad302092b6d0a89699f564c2 SHA-256: 944c750fd11d7cfeedf9e7b68379e6cd2c3a5b793cb46fe482a4b386d7f357fc
214 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. The file embeds a large number of external links characteristic of an SEO link farm and 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 0.9997

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/strik?utm_term=essentials+of+lifespan+development+3rd+edition+test+bank In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_5fa814bef35ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_5fb72e5a8e16e.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/komub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_5fad31b54da3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_5fb34672d5812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f897f35d5f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_5f9d2501ecfb0.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/bbf18e02ad14e09.pdfIn PDF document text
    • https://dumitekajeru.weebly.com/uploads/1/3/0/7/130740207/3790761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4858f759-6855-41a5-89f7-d67ff910a515/68713179827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95dbd63d-ac76-46ca-a21f-c1fdcc7a7dbc/how_to_cheat_on_toy_blast.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/mpow_h5_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/download_bloons_tower_defense_5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC0 5360 bytes
SHA-256: cf0220d6a140c479d6d0493a415edf0594d1b3870e741f672bb6da7d091654d8
font_01_sfnt_off00014ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE1 10240 bytes
SHA-256: 081c0d874ba83c5ab14b8168d502ec0ed503892b764834e391d7ab47c871665f
font_02_sfnt_off00016fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FA3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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