Malicious PDF — malware analysis report

Static analysis result for SHA-256 db66d5186dd9cb23…

MALICIOUS

PDF

70.1 KB Created: 2021-03-06 21:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16cb1c5bfb4ee2c7038ea328f3ae9cf SHA-1: 55ceb36aea969a2451846cdd99f90ac23b209ea6 SHA-256: db66d5186dd9cb236468c3a1816ae98767475abe2827965fc722573c72fe19b8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and one of the primary URLs, 'https://midufefew.ru/strik?utm_term=schwinn+airdyne+ad6+parts+diagram', is suspicious. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. Although no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=schwinn+airdyne+ad6+parts+diagram
    • http://xidufefonudug.sportsontheweb.net/razixik.pdf
    • http://vajukadezazi.getenjoyment.net/download_novel_assassins_creed_renaissance_bahasa_indonesia.pdf
    • http://vugekowuzujed.scienceontheweb.net/rebelion_en_la_granja_personajes_secundarios.pdf
    • http://veruvipavopa.getenjoyment.net/what_happens_to_most_living_things_after_they_die.pdf
    • http://keniworu.mywebcommunity.org/67290970835.pdf
    • http://rolopigabetitu.scienceontheweb.net/balance_sheet_definition_financial_position_of_a_business_mcq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://judiserod.onlinewebshop.net/how_to_find_samsung_tv_remote_code.pdf
    • https://uploads.strikinglycdn.com/files/c7a281e6-c737-42b8-b09c-aa73caae08f3/dulipuparakulani.pdf
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_3945414d4f2a4e598f257dedfe407d7a.pdf?index=true
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_f2266d0397e24493abf9c78e7bb18f4f.pdf?index=true
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_f145a67207384cc2af254d9558e7bdb0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/60ce68b3-878e-43d5-b9af-9cb4e7538539/nazip.pdf
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_42956f7cab334ad99fbd5a56a610ba24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/460d40cc-bcf0-46e3-a0cc-da74da30af25/sobexejobotabifi.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_21d4d51a90534692a305d0e740aad2a6.pdf?index=true
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_1633d6f6e13945f3b0f1cad6e325452c.pdf?index=true
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_57fcb4512260413ab61e4c32c165eb47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/242cb01a-ffbc-4fb1-89d5-920c495ae242/xasiru.pdf
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_85b4b0958edc41ab8d2e257f17017c32.pdf?index=true
    • http://xomapagovujux.atwebpages.com/68549091364.pdf
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_6a0325693e534893a0e79c0a931ea435.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40f9753b-13f0-4eae-adea-e7bb0c5b3262/refelutimiwus.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f4fd369474eb46fe86490d0d316593ae.pdf?index=true
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_3642df2d969c454c93e06c59f6766919.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d348.bin
99b96cc8ef34e697e6e8df110cfd81605da35ff68cf1c470e538b78f1cc1625e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 5908 bytes
font_01_sfnt_off0000e753.bin
fff54665c7f9339c51f2dac84836ad0a27ec6637be85e2544d48104322fae435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 10376 bytes

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