Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc69f38fe9ed612…

MALICIOUS

PDF

72.0 KB Created: 2021-05-22 09:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6f75f94498b956d433fde9ae9192f2b1 SHA-1: 20abfa3074800c1d764bd0518f41c5dd51a7ec9b SHA-256: 2bc69f38fe9ed612f1796901de18b45e23fd5fd25d3d38f55a5bfeb70c99c947
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=exercices+accords+groupe+nominal+6%25C3%25A8me+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472475/normal_6059b273118e3.pdfIn PDF document text
    • https://xixurisegiwawaz.weebly.com/uploads/1/3/4/0/134012782/nukulozofebowirase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_600c6ffca2318.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/9278186.pdfIn PDF document text
    • https://welaruno.weebly.com/uploads/1/3/5/3/135325412/rifepusijelivib-fozininavepuz-vimufavogilojo.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/bomupotepe-wipixetifuvaluf.pdfIn PDF document text
    • https://vidolatukala.weebly.com/uploads/1/3/5/3/135316506/225bcbf6904235.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/2729302.pdfIn PDF document text
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/851739.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/c69bb13877.pdfIn PDF document text
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/benexadasalefukado.pdfIn PDF document text
    • https://vudonifudiw.weebly.com/uploads/1/3/2/7/132741109/kuzidetubitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_60603d944fb44.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/juvosi/driving_school_2019_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/goxowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f710fb47-8514-4a3d-b44f-5358ae210743/el_espiritu_de_dios_piano_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/caffeine_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/detroit_become_human_pc_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c548bd34-7631-4730-947e-fd21ef06b629/machine_learning_con_python_raschka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadef27b-d079-4b74-8e89-7c8d4cbdd857/how_to_see_commands_used_in_autocad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c98a9a1-72fb-4178-8a29-c98c4bd05070/77129715489.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 5796 bytes
SHA-256: b4440e35f919fe2d4d104ec87748dcc2979d37410ecce55bcaf128f4406b8289
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 11956 bytes
SHA-256: 8261039e2d73b70bd31681e67290e3673273393993577368fadabe4d1bebee7f