Malicious PDF — malware analysis report

Static analysis result for SHA-256 909fac810e0e2124…

MALICIOUS

PDF

81.2 KB Created: 2021-02-18 09:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40445f1c1b088334e32b721390f45d3c SHA-1: 5a7425ce3b8d75c24eca77e80e16e3116d349ed9 SHA-256: 909fac810e0e2124aa7dc018f2baad89d18475eec7904a8e699f8872f8c8aad5
156 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. 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
  • 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.
  • 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/strik?utm_term=bridge+called+my+back+quotes PDF link annotation
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/9de11f08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_601b2d44bc8a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fe11f125a301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fe57f8479ab2.pdfIn PDF document text
    • https://pakajifovajopif.weebly.com/uploads/1/3/1/6/131607230/dovixixipo_ledisa.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/7a1c16f8a3de79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_601fabcb341fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_6005774b5ec16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fd14e1950bda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5fef9b713142f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380229/normal_60031825bca69.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/nirigimepunozufedes.pdfIn PDF document text
    • http://talenunuvowa.iblogger.org/upsc_zoology_toppers_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5fee4c263c57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383687/normal_6017f735970de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupisovid.epizy.com/disofimonapejisesavifuvu.pdfIn PDF document text
    • http://pewubep.rf.gd/92693602665.pdfIn PDF document text
    • http://zapuwoz.epizy.com/vegetables_pictures_with_name_in_english.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_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 5740 bytes
SHA-256: ad3a274a3667e113374fe9f9987fd8fad41832f0bc29cfcd9dc4a750ff474b02
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 11692 bytes
SHA-256: 11d521c4b28e6f2a778dab5dbb43724c449c57d6708126055a51cf6ac9cafddb

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