Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a34eeb0c4aa1c7…

MALICIOUS

PDF

85.5 KB Created: 2021-04-29 20:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d1ce8354f36bfb94a1b720836b8926fb SHA-1: 473caea44922dafe156c6653fc37916f6f3ff638 SHA-256: c2a34eeb0c4aa1c7550a0617a1a6061ae512607a247b175cf6bbb6f034cbe1d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=tuck+everlasting+book+report PDF link annotation
    • https://cdn.sqhk.co/rufadexu/JvVicif/42771032472.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/icQigi6/faxupatokefixo.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/jCoe4ja/32435033829.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/pvYKhaO/italian_romantic_songs_80s.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/zifcyjd/russia_victory_day_parade_1945.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/5aed9d1f-9dac-41e1-83f8-78b6e4fd529e/vijowuwimunajozox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6531705e-2e2b-42d8-a29f-7a6a0d8a75bb/25580757564.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_e21ecf9c5ad04bdaa44db2385c839035.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_172e998a0e134ba8acbab29d3b60176d.pdf?index=trueIn PDF document text
    • http://jopivot.rf.gd/autocad_download_blocks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890ccb3f-518a-4103-8def-ea212c4b13c4/jeep_grand_cherokee_problems_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c7377a-153d-458a-8414-343bb3765bb5/c_programming_from_problem_analysis_to_program_design_8th_edition_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5845e90d-8f9e-45df-b82d-f66183b1071b/rurez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6b9913-990f-4067-be72-68bdea581bb0/luzubex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/035eece6-f565-427c-9907-fe6a5e840da9/bronica_etrsi_manual_download.pdfIn PDF document text
    • http://zagutimidaf.epizy.com/misanikizonol.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_e104d0395ec446af873b078730c115a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34831e78-6b9d-4f2e-bdd0-15d83aecd9bb/how_do_i_troubleshoot_my_lennox_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cefb3ed1-d58e-453a-bad2-722f4e20f79c/what_is_the_code_of_ethics_in_real_estate.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f578ce8ddc874685bd83dd43572acb95.pdf?index=trueIn PDF document text
    • http://fevoreselo.epizy.com/42911766993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2813d72e-6a56-4125-95e9-f016ea2061f0/bumelekedis.pdfIn PDF document text
    • http://duvovopuma.epizy.com/adobe_premiere_pro_mod_apk_free_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cae925-0681-4358-888a-44120fca8a65/dipom.pdfIn PDF document text
    • http://roduzafudi.rf.gd/yajur_veda_upakarma_2020_in_tamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 5196 bytes
SHA-256: 51bbaf68b6cb77c5209898bfe56e7c43db2aeec1b987655db165e036c824f8bc
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 10848 bytes
SHA-256: 532bef39baed1ca671fca5e33ec59de411a1ab05415b368d5237aac650706e67
font_02_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34