Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b111c37ed4099cc…

MALICIOUS

PDF

84.4 KB Created: 2021-03-20 12:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39ed3f277cd2b0181b7c5a00222c2e84 SHA-1: e79d59b632c73eb14291447f765103a7bab1bac3 SHA-256: 3b111c37ed4099cc13c5a8c4a581efbb9ea36eb6de99762ec1a16be0c90198dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=clicker+remote+manual+klik2u PDF link annotation
    • http://reabook.online/luxotubivososudazipueqewk.pdfIn PDF document text
    • http://gtmedis.com/wudizewo6g6vy.pdfIn PDF document text
    • http://wordsidepost.top/introduction_to_management_accounting_horngrenytcw3.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/reinforced_concrete_designers_handbook_11th.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/duvurabon.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/46re_transmission_service_manualmi0ks.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/92050029166.pdfIn PDF document text
    • http://noziwop.22web.org/can_you_get_a_universal_remote_for_a_dvd_player.pdfIn PDF document text
    • http://honbiz.pro/18181726465spkgc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukozadagafewan.rf.gd/easy_animation_maker_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/bowovodosovine.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_19b8a8044a7941899d2b4e891bcf3579.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b583f89-ecf8-44f6-82a8-e2ab4de71205/vuvomusajumagowukuxoku.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/software_testing_experienced_interview_questions_and_answers.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_dc5c5224279642f88e1411bd997d1d14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c75d7f-6e85-4ce0-8957-d410459f8072/ejercicios_lmites_2_bachillerato_l_hpital.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/free_printable_gift_card_holder_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f839bb4-0937-434b-a8a2-dff6a2cd6aa0/saniborufu.pdfIn PDF document text
    • http://pekinomigaw.epizy.com/basic_english_lesson_plan.pdfIn PDF document text
    • http://wilazetifoka.epizy.com/97756637193.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/50341965876.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/97977608163.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 4868 bytes
SHA-256: 8dfe1e0e81a867af22bdedb8d3f31ccd96959c4c778698e68a4626ac4d6e2f0d
font_01_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 11484 bytes
SHA-256: 401a880182191a4644da55ff75885dc585bdce49562b9143e2bb70a77ba2c5ed

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