Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42f575ef56d110…

MALICIOUS

PDF

79.5 KB Created: 2021-05-16 17:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 77e02ac222b3ab65a43de590905cb6e4 SHA-1: e8d4e8b12323d373e706be8316a8ff25f9a6af96 SHA-256: 8f42f575ef56d110defea7fd89c03891fbe0b2ea6b050cd195ad37cfcda424cd
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'xezojetit.ru'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=elizabeth+popp+berman+creating+the+market+university PDF link annotation
    • http://zomoxoxuriw.mypressonline.com/textbook_of_electrocardiography.pdfIn PDF document text
    • http://rajenajodaf.iblogger.org/49116206545.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/survival_and_austere_medicine.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/61094679220.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/financial_modelling_excel_shortcuts.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/islamic_books_in_urdu_free_download_ahle_hadees.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/zisolazujagiporososelugex.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/3314559970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://welemup.rf.gd/futuguxaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/1460392865.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/some_and_any_worksheet.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_b3fc900307ff4376807367f615a1b061.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_11a2c4d3a8b24ddc8348f3680615821e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/fannie_mae_multifamily_guidelines.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_8ce7aaa15c2b4fcab493559eace03a92.pdf?index=trueIn PDF document text
    • http://xojudemavu.onlinewebshop.net/building_planning_and_design_ebook.pdfIn PDF document text
    • http://rigirulame.epizy.com/65181555859.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/poxasix.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_f0fa33d7427245cb8e041d52e04f2ce5.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_c5f4bbf3bd2c4f01b1326d36d864374d.pdf?index=trueIn PDF document text
    • http://rasevowu.rf.gd/motorola_g6_plus_qi_charging.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_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 5720 bytes
SHA-256: 42bfcfb3ca19f4f4afd4a28740d8e1001a18edd6c3f0681bb8ae83f158f517fc
font_01_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 10748 bytes
SHA-256: a51cfe9521f44978d783beabad73dc709accf5c881513ffc30e7dc4cc0ed3ffb

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