Malicious PDF — malware analysis report

Static analysis result for SHA-256 369509458d1e6603…

MALICIOUS

PDF

74.4 KB Created: 2021-03-26 11:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2d432920a2cc537b681c4855585cb4f5 SHA-1: 4452fe175cc55549eb9c9e66fe9c2937353caf15 SHA-256: 369509458d1e6603f2ae2d071ae9c4dc7cd7f25e6913e798e834fb73733394d7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary malicious URL identified is https://xezojetit.ru/wix?keyword=dropbox+maximum+size+free+account, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=dropbox+maximum+size+free+account PDF link annotation
    • http://kopolebukerone.iblogger.org/lojudi.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/6001af67-9f98-41c6-ba6b-4535e94d1f99/5_dysfunctions_of_a_team_book.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/apa_style_manual_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9889b5-151b-4c0a-895a-2bba795e8f6b/selenium_tutorial_download.pdfIn PDF document text
    • http://vowatul.rf.gd/fazer_assinatura_digital_em.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_6af2709a3e224b178ee2835e0b092db3.pdf?index=trueIn PDF document text
    • http://xelaful.epizy.com/adapted_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ee22b2-b44d-4942-b7a1-03a9162d4c93/62146313326.pdfIn PDF document text
    • http://budibebolimuxo.rf.gd/29956205028.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/how_to_use_tarot_cards_step_by_step.pdfIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_e3c36ce4d02341fa931748ce46f8af9b.pdf?index=trueIn PDF document text
    • http://rasukilore.epizy.com/4052798530.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_0d531554f8724c168c4bc513112867eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/dog_breed_quiz_15_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff2fb35-a0db-4e20-856b-83236c3bc58c/fogejeludin.pdfIn PDF document text
    • http://mujedofagogi.epizy.com/58999969730.pdfIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_2e0f04b52dc44c28a38ab8dabe492636.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76504fad-375c-4828-91e8-be742f59c69b/laxubewodaduvojekerefag.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_8f8a6a423b0a4834b54b62b60233bc2b.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_ca03985f572d47cb9ed97e5e19f3e261.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_857e29ef82d54a3f9e79bbfd639ed1ae.pdf?index=trueIn 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 5388 bytes
SHA-256: cbfb6a80ba0034f7fcd7b7d340100ceb76a8ac19ca5f00b320061c1a246147e1
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10228 bytes
SHA-256: 30c1ceaa3a19befcf215252e54f01360da13023db3a879dbfeb009cfe640974d