Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfc280e692415e9…

MALICIOUS

PDF

90.5 KB Created: 2020-12-21 09:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 711c7bb33c2b518738cd7cac39bc52a7 SHA-1: 42d35c8984f4556ad2d4391ac243e61b671e7076 SHA-256: 1bfc280e692415e96d2c08285c4aae62d4723839b777407a3e4bc679985e583e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, many pointing to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malware or phish users. The heuristic firings confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=crash+course+world+history+2+playlist In PDF document text
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/xorav.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/8892873.pdfIn PDF document text
    • https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/4196334.pdfIn PDF document text
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/1084647.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/8506430fe1a9d0.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/e4f1bfb883e44.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/598aa0a5-45e4-4496-8684-ca1baaf07288/95820619033.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/42576667625.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/calculus_chapter_3.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/zaxekiribipopijugikokamev.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_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 5392 bytes
SHA-256: 3d3f1a0f41a0a5205583ea8138435f78a63e683b0a712c345fb04be671496cf5
font_01_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 11740 bytes
SHA-256: 8747e01f8a61cb0c81929d33455e69384884ee9de64e6a53c14cf6bff91cd57c
font_02_sfnt_off00014702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14702 16288 bytes
SHA-256: 58fa7860bbb15fba7f57fd83cad25f914597cbf7b14872056299222866465ab1

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