Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfada9e8dcb4260a…

MALICIOUS

PDF

82.9 KB Created: 2021-03-24 18:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7d0c53878e8940af797739fb564da533 SHA-1: d64e670d83cd350590b7ad00736132afa954c963 SHA-256: dfada9e8dcb4260a0fbb9468b12b77baa12a2b67a3ae03bf92461267b11214b2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least two pointing to suspicious domains ('vilenefex.ru' and 'sakulog.sportsontheweb.net'). Heuristics indicate it's a link farm on disposable hosting, and a machine learning classifier strongly flagged it as malicious. ClamAV also detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=five+stages+in+public+policy+making+process+pdf PDF link annotation
    • http://sakulog.sportsontheweb.net/get_tough_approach_to_crime_definition.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/wadubajif.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/batuwoma.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/3d_modelling_maya.pdfIn PDF document text
    • https://fibexijenoka.weebly.com/uploads/1/3/2/6/132680926/3543413.pdfIn PDF document text
    • http://zatodawu.iblogger.org/notes_on_camp_susan_sontag_espaol.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/77906335496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_602e01cbef539.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/7898253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5fcdb83200ed2.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/wamize_tuvitudezegabo_pugesipavekuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5caa4fc0-5a28-41b9-8737-fb8965b97f88/static_electricity_worksheet_middle_school.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/73193351638.pdfIn PDF document text
    • http://gelutusuxipedib.rf.gd/zaridorovodemadetefoneza.pdfIn PDF document text
    • http://zuzinaxawalodi.epizy.com/florida_insurance_affidavit_form_83330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b27c2aa5-3651-48a9-9fb8-64c5ee219862/trombosis_venosa_profunda_gpc_2018.pdfIn PDF document text
    • http://govasawoti.epizy.com/penoveredanizoze.pdfIn PDF document text
    • http://tolimimagag.epizy.com/most_difficult_decision_interview_question_answer.pdfIn PDF document text
    • http://migipezerur.epizy.com/dovoxosekojilulu.pdfIn PDF document text
    • http://belunovozexuse.rf.gd/scope_management_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4174d8-0d86-4894-89c3-4c865af0a431/top_colleges_for_interior_design_course_in_mumbai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fb237f-5e47-438a-836c-39d6543cb492/coggle_simple_collaborative_mind_maps_and_flowcharts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63c7462-c55c-48a0-9d75-b7068206f960/what_is_the_definition_of_rule_of_thirds_in_photography.pdfIn PDF document text
    • http://kafogateginoni.epizy.com/fegiputetepeberukadafap.pdfIn PDF document text
    • http://kifugelewepin.epizy.com/free_venn_diagram_worksheets_for_second_grade.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_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 5796 bytes
SHA-256: 661445755de78df8d896f340a22c7ca0974cff7486216ac8fee48cd3eb16ca6f
font_01_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 10844 bytes
SHA-256: cf3f5c67f6be6b1293341632761890fbfb3683c406489cca65eb9932966e9174