Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e6f95cdc423c8c…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 21:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3fcb96a650c1b64cf9e8ed41f1a0b7bd SHA-1: 8906874952d370b2e5e8ba636052bdc7b301afc2 SHA-256: 33e6f95cdc423c8c2c7577dd8d660d9446539ab1b5ab13b90772fd7576899892
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://zajinet.ru/123?utm_term=acls+medication+guidelines PDF link annotation
    • https://pumoguviponurin.weebly.com/uploads/1/3/4/7/134773216/248bee7dfeb.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/1c5493b69c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408983/normal_5fe40b7a68be4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_604d215adc7bf.pdfIn PDF document text
    • http://rokemefofiz.iblogger.org/anticholinergic_drug_list.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/9b35d8716.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/6311034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6059efadb21a9.pdfIn PDF document text
    • http://bozenuvobe.iblogger.org/biblia_reina_valera_descargar_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_605b86bea5a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6011e8dd9ab9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390097/normal_5ff446b341ccb.pdfIn PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/af120b4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_6033ec853d976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_6047fbc298a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_6026247b3230a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zopenave/dwg_viewer_android_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/47006741645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd6d339-4860-4abb-81ac-eb2da6819619/international_journal_of_applied_business_and_economic_research_impact_factor.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/xelodasobofakidokavi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/15397802576.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/87283474422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d11e4db-7e09-4755-ac15-de76f480d25f/best_used_cars_under_10_000_euro.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/information_about_bronkhorstspruit_primary_school.pdfIn PDF document text
    • http://bovifuxabobi.epizy.com/sowulilisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bfa479-dafa-489e-8f2e-ec25fd5ea15a/82669684375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53df30cd-7080-46c0-94b4-fe5ebc88dd31/brady_tls2200_memory_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45abdfeb-3fbc-4b99-937d-2f9b88ff6d93/warcraft_3_remastered_cheats.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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 5152 bytes
SHA-256: 4a10ab38285998f4bf52d4fa75c0f9f855e1ce1e4376b467667bcaade8a18642
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 10920 bytes
SHA-256: fe989060cda62e3bbe96d9b8774e813518c7c90d3fa2edd4ec79a3e985f163b3