Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4103c2b730c8ba7…

MALICIOUS

PDF

77.6 KB Created: 2021-06-10 17:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c014d4f403d9250dec8f8c03ad709fc8 SHA-1: e1cdbf01ec588839235ec506858879ec0fa6c6de SHA-256: b4103c2b730c8ba79215a35298e145e478c80a10600ac37a5f00a38c130519eb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste commands into a shell. This is a common technique to trick users into running malicious code, likely to download a secondary payload from the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://coretry.ru/pbw?utm_term=convert+mp4+to+avi+software
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/db630895407.pdf
    • https://nejufolij.weebly.com/uploads/1/3/4/8/134883139/2554053.pdf
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/7427532.pdf
    • https://jubagimijan.weebly.com/uploads/1/3/5/3/135333733/wuzat_subuvusafafigup.pdf
    • https://nagagixibedixu.weebly.com/uploads/1/3/1/6/131606435/sosukubedakumutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/43a7a4e3-d6be-41a7-a54f-ba776855f8fe/inbound_delivery_display_tcode_sap.pdf
    • http://xuzokufo.pbworks.com/w/file/fetch/144985575/tamil_hollywood_movie_download_isaimini.pdf
    • http://nagaxop.pbworks.com/f/avi_to_mp4_converter_free_download_filehippo.pdf
    • http://nolumemonip.pbworks.com/f/darokerudurow.pdf
    • http://fisaramunuf.pbworks.com/f/25836246698.pdf
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144510471/bloody_roar_2_descargar_para_pc_gratis.pdf
    • http://fatakalewene.pbworks.com/f/diwijilusi.pdf
    • https://uploads.strikinglycdn.com/files/c60c99b4-a989-494e-ab6e-2c62a22d798e/mopusurabevudofiv.pdf
    • http://dawijunegolo.pbworks.com/f/superior_tactics_rts_mod_apk.pdf
    • http://pikalunik.pbworks.com/f/58893417209.pdf
    • http://sazupamufode.pbworks.com/w/file/fetch/144591411/libro_los_5_lenguajes_del_amor_de_gary_chapman.pdf
    • http://ruxafonan.pbworks.com/f/el_poder_curativo_de_la_cabala_completo_gratis.pdf
    • http://degomulaxib.pbworks.com/f/fimepebuxilopemat.pdf
    • http://wuwazilizos.pbworks.com/f/40657105783.pdf
    • http://sogotobev.pbworks.com/w/file/fetch/144897756/56323741500.pdf
    • http://kakewizajupe.pbworks.com/f/cbse_maths_sample_paper_for_class_12_with_solutions_2019.pdf
    • https://uploads.strikinglycdn.com/files/af6769c9-cb1d-4d70-b126-74670ab952cf/what_is_density_of_fine_sand.pdf
    • http://fokurid.pbworks.com/w/file/fetch/144684159/vesizesa.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144423117/79435374831.pdf
    • http://xejujaser.pbworks.com/f/roblox_boy_char_codes_2020.pdf
    • http://barumena.pbworks.com/w/file/fetch/144440010/lazoxi.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_off0000f244.bin
e30f1e254caec3ebce51ea03f5df238ab0a1acadc30e58c92a5166d74e879429		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 5160 bytes
font_01_sfnt_off000103d1.bin
d9c3d765944d0359f37e325d235213048fb53ad8751b5234e634332d636c9452		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10844 bytes

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