Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4c12ad4b9a3fc7…

MALICIOUS

PDF

77.2 KB Created: 2021-03-12 10:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 266b77a5cd57d88ade420e0a26f718fb SHA-1: 2cb2040dfca91e527d45f84121d5bc7765334e5f SHA-256: 9e4c12ad4b9a3fc7a72f136fb54bafe423197ceb56f2f2f03331c66a9ce6a829
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The document also contains an instruction to disable security software, which is a critical indicator of malicious intent. The presence of embedded URLs and the overall structure point towards an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://maypoin.ru/123?utm_term=autocad+2013+serial+keygen%2528+crack PDF link annotation
    • http://intereriia.com/baldi_s_basics_easy_mod_apkr6dkb.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/u5Qidjb/zombie_shooter_dead_warfare_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/fhhg6hh/48458796582.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/what_does_the_health_department_do_if_you_test_positive_for_covid_19hkekj.pdfIn PDF document text
    • http://bioforcecolumbia.site/authors_purpose_in_writing_orpheusycys4.pdfIn PDF document text
    • http://runmasten.online/6964999499008zf3.pdfIn PDF document text
    • http://wowitaly.space/blessing_tv_tamil_christian_songs_freeaw7sj.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/gTnijjh/how_to_beat_the_boss_bloons_td_5.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/cached_data_in_android877ty.pdfIn PDF document text
    • https://cdn.sqhk.co/jepinixawide/fijihjl/wogusilem.pdfIn PDF document text
    • http://jenupekob.iblogger.org/28511992089.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/je2s2sj/zufadimaxaxodusezoga.pdfIn PDF document text
    • http://afracheat8.xyz/minecraft_1.2_8_apk_centro_comercializnz4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_1e81f36ace6d4af2927073aadb2b53d4.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_7b2ef337b4734595b2dbf0241c9d4a70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47914c5a-5303-4535-961e-e75ca443776b/lippincott_biochemistry_online_book.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_b69c97d9bbe64b45a3804176c1992c25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b0eff4-5754-4416-b6bd-1380a86b9c73/cuales_son_los_beneficios_de_tomar_agua_de_romero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8dd3e7-1cf5-4492-9bb7-b59f2d0c72bd/past_continuous_tense_exercises_for_grade_5.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/pomagugub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a75884-7eee-4251-a721-e07c201652a6/47498503166.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_b416b1ca371549c2b83761219523d90e.pdf?index=trueIn 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_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 5832 bytes
SHA-256: 57a5c4d2c7c328c677792fa3dae7bf72c10abf939918407f75d642dfc6ac0d42
font_01_sfnt_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 10720 bytes
SHA-256: 4199abb665e3bb829fbf22641e9a6042f41c6443d8af4a93a24fb56df78abd58

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