Malicious PDF — malware analysis report

Static analysis result for SHA-256 3951dd6ff0abc06d…

MALICIOUS

PDF

115.8 KB Created: 2021-04-02 17:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 40cc7f192c70946f2f6c89040652cc80 SHA-1: 59dc8ef766ae28381a50ae378fa18d339c84ea87 SHA-256: 3951dd6ff0abc06db8b6f70e25608740b2bb4e09bdaa96684272b34156ba253a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to medical criteria, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=icd+11+complex+ptsd+criteria PDF link annotation
    • http://vexasefagi.scienceontheweb.net/add_and_subtract_unlike_fractions.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/2020_nascar_xfinity_tv_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498324/normal_605f30e8410ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5febf08b188ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_5fdbe114c07c2.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/autocad_tutorial_2020.pdfIn PDF document text
    • http://sokuzise.iblogger.org/wireless_backup_camera_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_60325937ee8c8.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/annuity_due_formula.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/dnd_5e_players_handbook_free.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/sfdc_apex_developer_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_6031ad2987c7b.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/toyota_camry_hybrid_repair_manual_2007.pdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_6055b6b69c07c.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/xigopunukebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_602ae35a25a0e.pdfIn PDF document text
    • http://digovin.getenjoyment.net/john_deere_190c_steering_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapibudajemuk.atwebpages.com/49171255261.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/dinosopafasowigowi.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/business_directory_website_template_wordpress.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/temiwagajo.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_off00018966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18966 5276 bytes
SHA-256: 2a76e8b9141ebce31fd7af10c87d4dd488c1efa0ee0c7d57b7fbc5ef855a4e78
font_01_sfnt_off00019b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B44 11324 bytes
SHA-256: f79c0116a9cbd56b358ea51a34adae981bdefc5cec9736c6848a797bffbb7989

Open this report in the interactive analyzer, or submit your own file for analysis.