Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6da7a1cdd1715b…

MALICIOUS

PDF

73.1 KB Created: 2021-06-09 05:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 34bd22492b09ea165f700a2cb68befc6 SHA-1: cc9818411f5a3fc8400330ed3a5d149eb2f7cb4d SHA-256: cd6da7a1cdd1715b9339ec351dad14945534e209495d651b05a2e6c831a60494
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://coretry.ru/pbw?utm_term=3ds+max+step+by+step+tutorials+for+beginners+pdf PDF link annotation
    • https://jukakolirofo.weebly.com/uploads/1/3/1/4/131408741/sinodamose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_6039199f5aeb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_60296ccbd2ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_60566d18890de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_5fc95bcb6b717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_606927bfced12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_606ddc27c07d5.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/zumazeneri-foduwefasexaten-rojokokolob.pdfIn PDF document text
    • https://pozagawev.weebly.com/uploads/1/3/4/5/134580069/0b5ae576f7eb670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fe1d5f9a1d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_60343ae9380e3.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/853516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_60543dd2b7e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448328/normal_60443b83b0e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_60bc1c8e41905.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/396153a2-f42e-4c10-bf7e-8e48de83bd7f/32260719175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adf7b0e-c83c-4b23-a1b6-fd560c742928/gotogulabovezeraraxeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1598af4f-a2e9-47a2-b2c6-8f6a5a111968/48625225065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3afc31-8c4a-4b3b-9441-218564804114/introducing_phonetics_and_phonology.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5740 bytes
SHA-256: 3e7034bb24fcb2dc9a616e50d8183c7457a60535a7a38964e08ad9c563f51b45
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 10472 bytes
SHA-256: 3ef6bdb9209f57b8d27847950dac23ef1776edaa3ea8839f8a36236596fe6c75

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