Malicious PDF — malware analysis report

Static analysis result for SHA-256 de102b21873a9b50…

MALICIOUS

PDF

79.9 KB Created: 2020-11-13 18:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1a672cf441567eb262a8932c3bf5de8 SHA-1: dd12f62d53a9001eaa8a73ef34d0518fdecdb00f SHA-256: de102b21873a9b5068c8b1a458b5dec3e0d4345d4933ee3b5dde692b2f122f3b
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 0.9998

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.
  • 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://cctraff.ru/123?utm_term=interval+of+convergence+taylor+series In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f8a8dc246f01.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/depodenozipiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5f8ec3ea50cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_5f91cf7448d49.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/5781639.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/mozefimotaginufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f92173bce452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_5f9e2f71eb281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fad6c19255ad.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/5132851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5f9e68f0b328a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f95d4aa1ec4c.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/168e56c6-c547-45fc-a89d-75cca2c78c23/29792656713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d6465b-a467-4a7d-98fc-638e711ba923/nerijazinamotadegixewuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c248cc-ad71-40bc-a983-be6d6669fb7f/80571270540.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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 5148 bytes
SHA-256: cc51e89ffde0048e75da6330b75dee2b81ab71d500605f50698025ebc176372c
font_01_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 13028 bytes
SHA-256: 79bc0a63e6c68dc1cee0cf38dca7a4f24ee203447c67d234bb72f89553478c07
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 16264 bytes
SHA-256: 5967d31169733159138a564b7c4a0fe84099a45557430f92ca3974b90e0c1369

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