Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d3b10461e8acc6…

MALICIOUS

PDF

84.5 KB Created: 2021-04-13 22:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 881b16b713f31b4391e406992e820e86 SHA-1: 7536d09b1338b1329e5a7799ff59705e936ef95e SHA-256: 12d3b10461e8acc6466421f0fe773dcdc3984647d40b9acfee5745c3450723ec
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely intended to host a malicious payload or phishing page. The document body, though partially corrupted, suggests a lure related to the US education system, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=why+is+the+us+education+system+so+bad
    • http://xolixelov.22web.org/ravujedesibinup.pdf
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/mexexusajosubiraku.pdf
    • https://cdn.sqhk.co/vozevadijut/Nig9ggv/idle_car_game_download.pdf
    • https://cdn.sqhk.co/sowanigog/ghhcOux/mebuwonilekokitukezuwi.pdf
    • http://movajapenakinu.22web.org/anonytun_prime_descargar_apk_2019.pdf
    • https://xefolulewonud.weebly.com/uploads/1/3/1/4/131406676/tazosatavutunat.pdf
    • https://dodagifudawawub.weebly.com/uploads/1/3/4/7/134750091/gokeva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_f2ba8dbcc73249e39d73c7ee832e8214.pdf?index=true
    • https://uploads.strikinglycdn.com/files/36ce7b67-f679-47d6-8090-360b28231977/is_myer_briggs_valid.pdf
    • https://s3.amazonaws.com/jifesu/norusobuzamuzaridemiv.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/sodenanuvefunegusowotawer.pdf
    • https://uploads.strikinglycdn.com/files/84c2da8e-6724-40fb-9203-4c2383e90cd7/96260653442.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_4e045e2af9af4e13978dc3045c03803b.pdf?index=true
    • http://wafibajew.epizy.com/free_printable_2020_calendar_templates_with_holidays.pdf
    • https://s3.amazonaws.com/tipikaxe/beviduzu.pdf
    • http://dezusuratadaf.rf.gd/alligator_1980_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/6082c744-849f-4e55-9bda-fbeb4b6e95e8/busatubekitiseranigise.pdf
    • https://uploads.strikinglycdn.com/files/50484430-7f48-4811-a1d2-f6de5701f7cb/3370467332.pdf
    • https://s3.amazonaws.com/badodemebo/compound_sentence_worksheet_year_3.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_off00010cdf.bin
14cffd6c85cf44e1b13d579f4d1ad90b44f0b2a164dbef7ec92eccd689ecaf20
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 5308 bytes
font_01_sfnt_off00011eda.bin
2371e1e5bc99cb56732ad220549fd94a4a8b74d8da570a6e1714ef2eb4052f21
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 11152 bytes