Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cc3a7a250f780c…

MALICIOUS

PDF

69.9 KB Created: 2021-03-18 21:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b61313e1777489dd8e1d9dd0f2498b0e SHA-1: 5b79cfee84aa0b40cbbab74c0eebfbe8c3e7a9f8 SHA-256: 36cc3a7a250f780c360736bac08a6297ec4e238415f749ef82fc7209407ca488
126 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=glorious+bj+putnam+lyrics PDF link annotation
    • http://kakerusejom.iblogger.org/que_es_arrendamiento_financiero.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/gupejonalusexejiwosano.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/the_adderall_diaries_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/gggehiK/89080248226.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/datap.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/startup_business_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/QidMjdS/rise_of_skywalker_general_hux.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/h7jij95/color_flashlight_alert_call_apk.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/72280733087.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/kewimunafibusamas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_fd192cb3293c4af3983d59231ed555b0.pdf?index=trueIn PDF document text
    • http://wivufakumetewiv.rf.gd/descargar_la_pelicula_en_el_tiempo_de_las_mariposas.pdfIn PDF document text
    • http://rovijog.rf.gd/scanned_file_sample.pdfIn PDF document text
    • http://wavubodalut.epizy.com/tu_ashiqui_serial_song_ming.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/high_seas_maritime_law.pdfIn PDF document text
    • http://pidezesu.rf.gd/lefajewasob.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_4c2700e3e37d4ac6b637d94c620b0ae6.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_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 5428 bytes
SHA-256: cd9ceb0228248ac7d9c0daffecd371440f1325b3b93b0ab6c6ec62f8a0b0176f
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 10600 bytes
SHA-256: 9766b942913cc658c673e7fb85c133b53d4bd63b232c1c35595d42891ebdbb6a

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