Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c399689152dd5e…

MALICIOUS

PDF

96.5 KB Created: 2021-03-22 23:31:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 32a2382c9f9b4e7f8528054a982bc673 SHA-1: 9bdf1cba22b3ef2c2b8bad7461f2a6cafa191fbe SHA-256: b9c399689152dd5e78ed67e82426b8493ffc58432824cfe7d0d327cabb30a3c9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/wix?keyword=swtor+concealment+operative+6.0 PDF link annotation
    • http://tuderoba.getenjoyment.net/cathode_ray_tube_experiment.pdfIn PDF document text
    • http://rimka.xyz/blouse_front_neck_design_images_freeqbu6d.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/work_instruction_template_in_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_60113bcb04539.pdfIn PDF document text
    • http://zesamoa.online/sikenoxesawepagiruvutoj92r1u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_6011b1843eb5d.pdfIn PDF document text
    • http://podcard2020.site/givenuvoxofubfuj8k.pdfIn PDF document text
    • http://hiziryigit.online/libitipirad7ynnj.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/barreras_de_la_comunicacion_interpersonal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_6042cce574019.pdfIn PDF document text
    • http://epaytds.xyz/8358826589uwfvw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_c398f173a66144068ceeff0ccce31f60.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_99bc0bfcf727414a8abb076e3309dce3.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_67d5bac99e124b58a898309b8333ea67.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_0453829a700e43679725b35a588bfc8c.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_0a4edc99390247edb3ce10a2634ce05a.pdf?index=trueIn PDF document text
    • http://duxuvogavibu.epizy.com/atonement_book_review.pdfIn PDF document text
    • http://gawexerexi.rf.gd/wadesexokuvopujikaxu.pdfIn PDF document text
    • http://gusalixofunek.epizy.com/46167867907.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_fa28b8fe7e90498cafd6167230638b86.pdf?index=trueIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_4f13f42799c64615a992f3a69bec834a.pdf?index=trueIn PDF document text
    • http://buvozosasubatib.epizy.com/manetudupopomonafabef.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_off000137da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 5484 bytes
SHA-256: 3c96a353a51a5ded5d4289dab3b170226c01d5f8982e7089e4aeaafa0f5e0294
font_01_sfnt_off00014a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8A 11700 bytes
SHA-256: e3184295c052649aa4266d167b87edf264a507b98513b256ead5f89affdf1e75