Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b2a9a31f787639…

MALICIOUS

PDF

82.8 KB Created: 2021-03-09 13:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2d8fdc60f9aa057d391290d6c8c567ca SHA-1: 518721ebb690a76f624a939f340b39442c7ae313 SHA-256: 82b2a9a31f787639bb7a5d3d2a55d4122ec19617533a7f217507f6ae1cef2e0b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious content.

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://vilenefex.ru/award?keyword=biblia+ortodoxa+online+pdf PDF link annotation
    • https://cdn.sqhk.co/mifodirula/heQbmWE/malikaputu.pdfIn PDF document text
    • https://cdn.sqhk.co/lixozimiz/hbggEzl/41877963219.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/cognitive_dissonance_experiment.pdfIn PDF document text
    • http://gepatoxax.iblogger.org/95824306702.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/69168007102.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/resistor_color_code_app_ios.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/68863831042.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/translating_verbal_phrases_into_algebraic_expressions_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/pBhj9qA/16178541101.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/il4HieI/40998985423.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/fgwaiuN/vivafukasise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2d5bd547b210488c9c512abf4963b321.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_a513afd80efd40f983c42b0e667f421d.pdf?index=trueIn PDF document text
    • http://vofofoduwegakuv.rf.gd/new_audit_report_format_in_word.pdfIn PDF document text
    • http://vuruwabudakase.epizy.com/record_video_using_front_camera_android.pdfIn PDF document text
    • http://pigutun.myartsonline.com/stack_on_gun_safe_code_change.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/takaki_a_different_mirror_chapter_15_summary.pdfIn PDF document text
    • http://fuvoxibid.epizy.com/web_api_interview_questions_and_answers_for_experienced_c.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_e643dcd910964c67b1ac678bc056acbd.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_a2eb55496849426bb228e4f5db6ecc55.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_b06a4abce9b44aee91f7793832026bb0.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_9d7885d7de7745469cfdf9196bed4728.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_off000108bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 5116 bytes
SHA-256: 28835304bc2d16aac25cd1c7440e9e10675058cc57ac4d3e4f1491bbe41853e7
font_01_sfnt_off00011a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 10448 bytes
SHA-256: 5dc6665bad5d7bacbdb72e6a54a6f91f9268efd65aaba1df43ab16ebc1c049c1

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