Malicious PDF — malware analysis report

Static analysis result for SHA-256 927a467af356ab10…

MALICIOUS

PDF

81.8 KB Created: 2021-03-08 20:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 670ba452d72a33d9efd49c78c29ac8d4 SHA-1: dd34b1e8a6b4170dd71ea1b8452535acc1860cc5 SHA-256: 927a467af356ab10eea4b5b25652ac9e7ff834d570b4fee0fef122ab3d9e27b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one that appears to be a link farm, suggests the document is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm on disposable hosting, reinforcing the phishing or malware distribution nature of the document.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/123?utm_term=collage+maker++windows+10 PDF link annotation
    • http://bemowasogikoj.22web.org/chidiya_wala_game_ing.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/how_to_answer_text_dependent_questions.pdfIn PDF document text
    • http://nominasacra.ru/3560565361376f9h.pdfIn PDF document text
    • http://gagilirefoj.22web.org/55653103535.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/wevigizosuk.pdfIn PDF document text
    • http://xteenware.online/disadvantages_of_titanium_glassese7env.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolinupumilafud.epizy.com/tujovabufasunerolumuk.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/commando_game_for_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/coordinate_grid_worksheets_2nd_grade.pdfIn PDF document text
    • http://suvokejixu.epizy.com/l1_support_engineer_interview_questions_and_answers.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_803ec2892c29427db8c2479e17b9fb72.pdf?index=trueIn PDF document text
    • http://vetuvadoxawiton.epizy.com/newujexurorakaputep.pdfIn PDF document text
    • http://wadokeg.epizy.com/accounts_receivable_balance_sheet_example.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_85f7122d25394648bbb8bf129c7fe7f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/inspector_wexford_episode_guide.pdfIn PDF document text
    • http://tepuvat.epizy.com/scattergories_list_6_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/concrete_technology_interview_questions_and_answers.pdfIn PDF document text
    • http://kimuwasozapuse.rf.gd/replacement_parts_for_vax_carpet_cleaners.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_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 5400 bytes
SHA-256: 9643e87a5f19ad4379c9cb59ae0e72e9d46ce6aa77f449bf1c3c2f3addd3aff0
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 12504 bytes
SHA-256: f3da0d15acb3c411fa4e832e87e0430cea74f6270acca7b5ac7fc7ead14fd1ae
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 16192 bytes
SHA-256: eefdb006a8226603b1a5b62df6dc08fc1ab0a5e00be3b40f920b04aca04c475f

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