Malicious PDF — malware analysis report

Static analysis result for SHA-256 524ce92d94d6c186…

MALICIOUS

PDF

77.9 KB Created: 2021-02-04 10:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 199b9792e9b2498933f57cfc9ca09434 SHA-1: e7abb5823594d6e7d8c7bf402f17d18622542da2 SHA-256: 524ce92d94d6c1862ca39703c8c533e593fe983390374654d91941adfd3f5276
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ClamAV as a phishing trojan. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The document body, though heavily obfuscated, contains keywords related to software downloads, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/wb?keyword=windows%2010%20full%20version%2032%20bit PDF link annotation
    • http://xajoraxi.22web.org/happy_birthday_piano_sheet_beginners.pdfIn PDF document text
    • http://private-channel.site/gateway_b1_test_answers_unit_5ezll3.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/nuxajuwo_gebedorazipu_silewamagafu_ruwumalowi.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/total_video_converter_full_version.pdfIn PDF document text
    • http://freud.icu/halo_trial_descargarh6ptf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_6010f2e5568fc.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/devumolubevedotiwasum320dm.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/5914957.pdfIn PDF document text
    • http://raffle.website/71538136642wjo7t.pdfIn PDF document text
    • http://zubiki.top/27713977535r2h68.pdfIn PDF document text
    • http://steelsho1.club/pokemon_mega_fire_red_download_pcw4a83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383794/normal_5fdf80e1ccce0.pdfIn PDF document text
    • http://dsv-trening.ru/the_final_solution_chabonxas8v.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/4be27de9d55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ligededeju.epizy.com/eve_loyalty_points_guide.pdfIn PDF document text
    • http://banamuf.rf.gd/capillary_malformation_mri.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/1196096510.pdfIn PDF document text
    • http://borarujedumamut.epizy.com/50459680348.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/deploy_azure_function_app_using_arm_template.pdfIn PDF document text
    • http://zarazemudaseri.epizy.com/miripiwebug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 5368 bytes
SHA-256: dcbc0ac2b876ffe7d4742e5e97be74d6854c925bd8601042fb0aeecd09c04c3a
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 10572 bytes
SHA-256: d1d575e2f4be37448478c45fafb93dcf4799bf36f7c1c84e93fc43042f25935d
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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