Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b3bb4b5b2b8f5f…

MALICIOUS

PDF

91.7 KB Created: 2021-03-30 18:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8e5fbf1df09b20e60fa36bbb047a0eb SHA-1: d9f1db06868886d985ef27e53a4fd7a58d69e7ff SHA-256: 18b3bb4b5b2b8f5fffadfb8b04e5de427b8004e750ae9041d35bf182d9707ec3
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to potentially malicious sites, as indicated by the ML classifier and ClamAV detection. The document body, though heavily obfuscated, appears to be a lure related to educational materials, suggesting a phishing or scam attempt. The presence of external URIs and the overall malicious classification strongly indicate a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=journeys+reader%2527s+notebook+grade+5+answers+pdf
    • http://tranquils.space/pearson_verbal_ability_and_reading_comprehension6adti.pdf
    • https://static.s123-cdn-static.com/uploads/4480149/normal_5fe12da899530.pdf
    • https://cdn-cms.f-static.net/uploads/4390074/normal_603eea721a188.pdf
    • https://ratowoxure.weebly.com/uploads/1/3/4/5/134584599/rosewiben_mukejelugigomi_wokedoga.pdf
    • http://bred-enligne.com/peter_thiel_pitch_deck_template692p3.pdf
    • http://thedopemarketing.com/beretta_m9_holster_blackhawkdnv4f.pdf
    • http://zisapawiwako.mypressonline.com/present_perfect_already_yet_just_worksheet.pdf
    • https://xadixolikiz.weebly.com/uploads/1/3/1/3/131380305/latutuzunuko.pdf
    • http://creamwalls.online/tabebifamosuximogikilerin5ilx.pdf
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/7191889.pdf
    • http://national-verifyteam.com/536599454615bvjw.pdf
    • http://vash-komfort5.ru/solitenoduzajoguyy5yp.pdf
    • http://rineset.xyz/vulaturuicwt2.pdf
    • http://rotukefune.getenjoyment.net/build_my_life_lyrics.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/711f5f4e-d822-47ba-a957-b9e4807c5953/55933763378.pdf
    • https://uploads.strikinglycdn.com/files/ac8df908-afd3-47c2-9759-defefdd70160/32538229246.pdf
    • http://lamupimifuban.onlinewebshop.net/what_can_alexa_do_on_fire_tv.pdf
    • http://radiviwix.onlinewebshop.net/peterbilt_mechanical_engineer_salary.pdf
    • https://uploads.strikinglycdn.com/files/942809ea-cdd4-4232-9a79-556662c04ea9/92533703920.pdf
    • https://uploads.strikinglycdn.com/files/9a3c745e-14e1-4ec0-9d14-2009b8fc7bed/interview_questions_and_answers_for_payroll_manager_position.pdf
    • http://guseboses.atwebpages.com/adobe_acrobat_reader_viewer_editor_creator_apk.pdf
    • 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_off0001246c.bin
bfbba5bf4ac5e6b62fb7667cf3a234ea0cdb1ed260301ff6d485ce9bf83c741a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 5720 bytes
font_01_sfnt_off0001381f.bin
6d47481a454f79344d2f7116b96f8ac055781e3ea94a4098de7e7fdd7f50d31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 11364 bytes

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