Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4b9cd1f18b198a…

MALICIOUS

PDF

75.9 KB Created: 2020-11-13 06:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fffd12876b5e326d4e8bfb64fbe00cbe SHA-1: 0809447cf4055a39689ad613a21b3cdff8a88f09 SHA-256: 3f4b9cd1f18b198a346de372b1b965c8826de166f8a6cb8341d5cef7316709ed
186 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 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/123?utm_term=artificial+hells+participatory+art+and+the+politics+of+spectatorship+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f8722c0d1c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_5fa893cac7a50.pdfIn PDF document text
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/bexozuvabujiz.pdfIn PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/nofeki-jewoxiwuf-bofim-jilevul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5f8d26dad0110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8a5ac70049b.pdfIn PDF document text
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/8369402.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/5663482.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/9092635.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/8420537.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/47f6d43f-531b-4b2f-beb0-941fc30afe3a/61131399131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60be7048-bd08-4090-8d80-424a6ac44779/el_fin_de_la_infancia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700f53e6-6895-4aaa-83ec-31aa1562050f/zekuvojurulalufona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8e89e4-386b-470f-adb7-f77450db0e3b/73122878840.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
    • https://clck.ru/MB8Wc���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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 5336 bytes
SHA-256: daffa1e0dabffe6b998e42147caf49a218a5b3e67166a68a8470cf165ba0f08e
font_01_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 2484 bytes
SHA-256: 2df1b9dce670309926354d948d51d352d2f4676f8b4db8c4bee96d1165daa0ba
font_02_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 10836 bytes
SHA-256: 7bcf7d2ea44491bec1ba759b2c15c0bac13580f3c75b5e93565e3193cb76bddb
font_03_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 16400 bytes
SHA-256: 877bc5dbe9f787c0ad6ae311e774a73c1d2d5ba10b8138c5af6f0f7cdfbad00c

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