Malicious PDF — malware analysis report

Static analysis result for SHA-256 697910c532d4d2ae…

MALICIOUS

PDF

76.3 KB Created: 2021-04-17 02:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6c71ca155259fbde39747f2cfe7765d5 SHA-1: 86896e68c289a23cc04d11c4a8b42966efdb1cd1 SHA-256: 697910c532d4d2ae5769b58a25d47fc1b4ba4c82880e92b22a7b042ca45d4193
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=fender+blues+deluxe+reissue+tubes In PDF document text
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/3681426.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/wagorufafurona-birova-vubidoxavuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fffb34315da6.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/9e3612518036c.pdfIn PDF document text
    • https://goxapuvuf.weebly.com/uploads/1/3/2/7/132741714/7dc5ad498b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_604d73a4272d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_6012dbdcbb6a2.pdfIn PDF document text
    • https://kibapeti.weebly.com/uploads/1/3/4/5/134515129/rosaxizubowovef.pdfIn PDF document text
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/dc0e3a8c1123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_6029756ef1141.pdfIn PDF document text
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/vusil.pdfIn PDF document text
    • http://mepamoso.sportsontheweb.net/balanced_scorecard_as_a_strategic_management_system.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/156e0b8.pdfIn PDF document text
    • https://niwitibu.weebly.com/uploads/1/3/1/6/131636677/wezowukag_zimegoxonox_wigugidivudu.pdfIn PDF document text
    • http://zulesaxeririv.sportsontheweb.net/biografia_anderson_silva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_600eaed61a194df3b77f76f1a79a24b6.pdf?index=trueIn PDF document text
    • http://ziwemasux.myartsonline.com/open_source_music_appreciation_textbook.pdfIn PDF document text
    • https://d8aee3b0-83ea-4a0d-b8f9-524a85b41d10.filesusr.com/ugd/105b34_f69694dd019d4ce6b2c6d65e8f615759.pdf?index=trueIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/xesetuzepu.pdfIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_7de470ad472a49b79f0353cc132fa903.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_3be80accad53433ab55affce87485c24.pdf?index=trueIn 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_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 4772 bytes
SHA-256: 072cccfb48db02e09c635945c250037504d0e13db7118ec3530564eadcdded34
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10712 bytes
SHA-256: ff6f9653ddf076f2e272ea3fb192b8bdfc55f198ec6bda4b165c35b7e2a2a3b5