Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bf1dddf83430a7…

MALICIOUS

PDF

64.9 KB Created: 2020-12-15 12:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b3ffb531b5cb33088cd853e910e56e49 SHA-1: 96c76b3ef4b71f217e953c473522fbfe248cd1e7 SHA-256: 41bf1dddf83430a7b42fdc1b0ebea6b5e05a8968880bdc8003991d6dd7cad66d
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=kid+city+museum+coupons PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410678/normal_5fa5d9545bd48.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/sawiwagupazemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446287/normal_5fb3da3ab447d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f88ef4cd6f3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcb50b2769d9.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/9326e619-de9d-49de-a9d7-376e729c10e0/93910814686.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77f3239503a47f6fdbd2f/t/5fd07a7acb6bfe602c516156/1607498370224/vugojuzuxixugajurujoves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7d97c4-d837-466e-8c90-6e88f6e4c722/everyones_an_author_2nd_edition_online_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcec723941bd0096f246c82/t/5fd18723ae71ea6dd317dcd1/1607567153353/73196647119.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc34985239b07229140aab6/t/5fca9f70d57e9b2d19b5049c/1607114611009/xetulib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef9987f-6d53-4791-b5cc-a3ee5ae6e14a/instrumentos_de_cuerda.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c42b085bf90c0e0336d5/t/5fc8d8d3d17d55300fb7d41e/1606998227855/clash_of_zombie_mod_apk_unlimited_gems_2018.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_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 4952 bytes
SHA-256: 2f7c72a14751ebcfdc082dd5424c41da9e8ae4fd04f24d13cfdd85e216eaf167
font_01_sfnt_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 10376 bytes
SHA-256: 58d5e7bc33e491278a7c8b8360d4404fa249f3d86ace4ec054e52b847776f9fd

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