Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8703931b3f14b…

MALICIOUS

PDF

77.5 KB Created: 2021-04-08 23:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e3c6e1385d6ff191f4e56bae26bc571f SHA-1: ce123f65e4e72541f9f7525e258e34c9b0fc4576 SHA-256: 13d8703931b3f14b28b923c489c2914f39f37f7e33c50254f24b6b7eb99ddafd
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains numerous embedded URLs, with one pointing to a suspicious domain ('seumenha.ru') that is likely part of a phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=broan+range+hood+filter+sizes PDF link annotation
    • http://xozanos.iblogger.org/xolagasozoka.pdfIn PDF document text
    • http://bopifakuta.iblogger.org/quantitative_reasoning_aptitude_test_questions_and_answers.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/40756241785.pdfIn PDF document text
    • http://ximoteduzax.22web.org/apprendre_le_franais_pour_les_dbutants.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/how_to_remove_a_cystic_pimple.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pederufe.epizy.com/sales_promotion_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce939b55-4ab9-4f71-bc37-0ecbaa9933d1/lozunufererazeladasodepu.pdfIn PDF document text
    • http://tofodubigar.epizy.com/numerical_ability_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b60b45-4109-4de8-97fc-37c088543d8c/scholarship_essays_for_high_school_students.pdfIn PDF document text
    • http://daboloxasorun.rf.gd/leziradovudevax.pdfIn PDF document text
    • http://nadanopo.rf.gd/bawutimi.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • http://bakilipos.epizy.com/in_which_of_these_bonding_patterns_does_x_not_obey_the_octet_rule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c691a7da-db0f-4c60-8d79-3108f9d86086/cuales_son_los_tipos_de_redes_de_comunicacion_que_existen.pdfIn PDF document text
    • http://wulukexererumus.epizy.com/27664042703.pdfIn PDF document text
    • http://nigukunedux.epizy.com/cahier_de_vacances.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151b0ce5-6530-4877-a3f0-c77bab85658d/nabaxikometud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0709bd3e-9e8a-4bc9-9109-dc61a1a06c53/16097842635.pdfIn PDF document text
    • http://gisumizubusev.rf.gd/49037770918.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_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 5268 bytes
SHA-256: e9e80dd14eafcd631c5da2850b7a85f76f032a6c5e10368ebeb03b16b2909bfb
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10564 bytes
SHA-256: f16f27f0e069b052382da045a7daaec082e2776e453546b658f9ab9b172afb63

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