Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8e9db9292f4432…

MALICIOUS

PDF

97.6 KB Created: 2021-03-12 18:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7f4f43c125bc91265bed645e7bc121ab SHA-1: 54b38b228a90fc1658d7fab0dc416c597251e9f6 SHA-256: 6d8e9db9292f44323b34473b2e0ac537707c4f01d20aaa88349ac3d7961eb4ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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 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=what+is+the+cycle+for+reversible+heat+engine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481280/normal_5fd04ac44023c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601615e35fe37.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/tazonun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_5fe47b3760973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_60356167701e4.pdfIn PDF document text
    • http://vaworudewu.iblogger.org/air_force_1_movie_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_601412ccedbac.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/zixomowufel.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/36082197236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ac90a274-ae9f-4118-ab33-2b089b41228a/96388687524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7a1deda-9231-409f-8164-5777172470ea/78544530482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77cfac3-fda1-42e8-b67c-401890ca2285/cant_open_zanussi_washing_machine_door.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e444ccd9-5cf8-4732-9bb6-fca354c4b5a2/sonic_jumbo_popcorn_chicken_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f38c573-249c-4968-be1d-4847f26629e5/journal_entries_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/bible_verse_train_up_a_child_niv.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/gleitmo_615_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/computer_addressing_modes.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/28674728235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1825539b-85b3-4c87-bd22-70f76e8fa3ef/crown_xti_2000_problems.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/lafesole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37605aa-1e12-4e73-8998-d92b074d9494/a_lesson_before_dying_sparknotes_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a48ea99-184e-4ca8-923f-b153dc91e82e/o_que_fazer_para_amenizar_queimadura_de_sol.pdfIn PDF document text
    • http://kugibujupedo.rf.gd/raxogivofezivikilovidaruj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 5244 bytes
SHA-256: 31e5b5d9f4638a1c48cc11ebe2d7b54f554e22f607115cd7d80339b79d5d9437
font_01_sfnt_off00012af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF4 12240 bytes
SHA-256: 5f2eac99506be8d490f6642a9cf0a935515aefdbb385e0084486351ecb19a589
font_02_sfnt_off00015436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15436 16336 bytes
SHA-256: bc8c99b9946fea643b7e606eff975609023ffce505ec057e455715d5a8586bb2
font_03_sfnt_off00016a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A07 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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