Malicious PDF — malware analysis report

Static analysis result for SHA-256 643124bb0a4f89d2…

MALICIOUS

PDF

91.3 KB Created: 2021-02-20 23:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cfd69e1306937bcf55fa0cbdaa437028 SHA-1: 1b58572990bd1c9754c543a7b34044d1ed860259 SHA-256: 643124bb0a4f89d2fcd5105bc82f3b5b5eb40948dc29b1cb4e7be986cb84ecaf
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://yafferge.ru/123?utm_term=discrete+mathematical+structures In PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/venuluzakowaz-xugoxejan-gelajebofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419193/normal_5ffc807338216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478430/normal_60177266bbafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6028f2e69748c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fc807d296911.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/podoromelizutozutepunadi.pdfIn PDF document text
    • https://cdn.sqhk.co/karewura/e3TUphh/22302906735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446275/normal_600bf88fec309.pdfIn PDF document text
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/suwesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_60304128983fa.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/gH1iigg/photo_lab_picture_editor_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_6013a287a3aed.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/MbH00jd/6585614776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_60208e8aee6b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/xapumobapulif.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/baskerville_dog_muzzle_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/bluestacks_for_windows_7_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/26312006288.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_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 5036 bytes
SHA-256: 157d9056892e3ed81e07ebac3458128240c08710ad9f990fcc69cf54f00ad1e2
font_01_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 12064 bytes
SHA-256: d27e7d146176fc18bbf17992a513cfa1f133e1851f272aaf71c6ef1fd604e019
font_02_sfnt_off00014969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14969 16400 bytes
SHA-256: 748d769687709d3db70b89e1c8b733fbd72217981b63a4efcbfb423ac3e27d82

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