Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85ff290e463d496…

MALICIOUS

PDF

95.2 KB Created: 2021-03-06 15:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1a5d94d334fc2644c8a43297859e8209 SHA-1: 75ccf81c182cebc4357d3d7208a8802726ff299e SHA-256: f85ff290e463d4962df219b7eade92ffca78b192a20da13b36eb14576fc3e7c3
204 Risk Score

Malware Insights

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

The PDF document impersonates a cloud service, as indicated by the 'SE_CLOUD_DOC_LURE' heuristic and the presence of 'Sharepoint tutorial 2020 pdf' in the document body. It contains numerous embedded URLs, with at least one, 'https://dafemum.ru/strik?utm_term=sharepoint+tutorial+2020+pdf', flagged as a malicious redirector. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature, suggesting it's designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=sharepoint+tutorial+2020+pdf In PDF document text
    • http://vnds-super.space/wood_carving_kit_nz1b6xp.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/kixonakogo_wokab_xanumisigijux.pdfIn PDF document text
    • http://wolotalute.iblogger.org/los_juegos_del_hambre_libro_1_paginas.pdfIn PDF document text
    • http://pihodze.com/rilunenuwufupavoxiov709.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/92809072142.pdfIn PDF document text
    • http://lotto-investclub.com/13249880260h2z0o.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/1152391.pdfIn PDF document text
    • http://smallita.space/19328762198cdz2h.pdfIn PDF document text
    • http://ita-yog.space/services_marketing_lovelock_free_downloadcdq9e.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/7a45b48c706.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/nufojo.pdfIn PDF document text
    • http://azakalaza5.xyz/jubagunedafogezal90mt9.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/5749540.pdfIn PDF document text
    • http://fafasun.iblogger.org/41672727931.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/Tlei9Gx/60786733547.pdfIn PDF document text
    • http://discount50it.pro/28953149059a60je.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/fxTck6C/49991953526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zawagebojirowe.rf.gd/double_sided_business_card_template_pages.pdfIn PDF document text
    • http://winenezufu.epizy.com/dexozomuwad.pdfIn PDF document text
    • http://jutademopewe.epizy.com/dividing_integers_worksheet_with_answers.pdfIn PDF document text
    • http://giverez.epizy.com/company_presentation_template_indesign.pdfIn PDF document text
    • http://madukavinoxonal.epizy.com/cefsharp_winforms_anycpu.pdfIn PDF document text
    • http://kixazogegome.epizy.com/67860779646.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 5212 bytes
SHA-256: c72ae9e0e44e38b59e917449209de91f648efe15358db07c415e02230f11132c
font_01_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 10752 bytes
SHA-256: 2a052562309244883b469ee2c49af0c4b22b083fa40bdc3a8aadd10585135455
font_02_sfnt_off000160f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e