Malicious PDF — malware analysis report

Static analysis result for SHA-256 115c12d2e414bbf9…

MALICIOUS

PDF

74.1 KB Created: 2021-03-23 10:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45f2b7d31eb53d0c4728330a728bc296 SHA-1: 73f1023b7170ac62da9ea58e045772e0566a810b SHA-256: 115c12d2e414bbf9c81fa0e193772241a1cdbc04279754e4d6b042cee581987a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains embedded URLs, one of which, 'https://zajinet.ru/award?keyword=medical+fitness+certificate+form+pdf', is presented in the document body as a lure for a 'medical fitness certificate form'. While no scripts were explicitly extracted, the presence of multiple external URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://zajinet.ru/award?keyword=medical+fitness+certificate+form+pdf
    • http://namelesssouth.xyz/business_letter_template_example_word6qe6a.pdf
    • http://venira.su/tiwobopatapejugeryg99y.pdf
    • http://kuvurewe.22web.org/4555513832.pdf
    • https://cdn-cms.f-static.net/uploads/4409413/normal_6021a56e43c9b.pdf
    • http://themarkuzmusic.com/why_the_cosmological_argument_fails92mte.pdf
    • http://beautysale.site/vanazudijaropash6h.pdf
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5ffe160185b3d.pdf
    • https://cdn-cms.f-static.net/uploads/4370541/normal_6020826041e46.pdf
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fce6b3dc35ef.pdf
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fc6b95a5f6b9.pdf
    • http://lnstagramcopyrighthelps.com/plot_of_fifty_shades_darker_movie79ya5.pdf
    • http://xaziligoto.22web.org/vubukolaripinagaxudor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wivunonovef/37327828766.pdf
    • https://uploads.strikinglycdn.com/files/1fe5de79-10d7-498d-8131-13f3d251bad7/hp_photosmart_d110_does_not_print.pdf
    • https://s3.amazonaws.com/xojafemori/free_rustic_wedding_shower_invitation_templates.pdf
    • https://uploads.strikinglycdn.com/files/10e5c524-92e6-4e03-8ba7-bbc747c9d78c/what_does_seeing_a_bracelet_in_a_dream_mean.pdf
    • http://ziresam.rf.gd/alif_ost_mp4_video.pdf
    • http://butemuz.epizy.com/astm_standards_for_tensile_testing.pdf
    • https://uploads.strikinglycdn.com/files/c43e933a-7ddf-4cbd-aeb7-776e6e0488e5/what_is_the_best_game_for_ps4_pro.pdf
    • https://s3.amazonaws.com/vizegemawokaxe/kajisaxosomen.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_off0000e4e8.bin
dc122fe81cb5f4569f04837a19257213e1ea516bcac35fa40502b360f8e2caff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 5304 bytes
font_01_sfnt_off0000f6eb.bin
e65ecf2a0549a0f181e00ba7a686bfab5c2231d7551b45c0eaed297a1f1c857f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10824 bytes