Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aefc69260a5da5a…

MALICIOUS

PDF

83.5 KB Created: 2021-02-25 05:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d81025dd4d58daf17e1601352c7de4f8 SHA-1: 4a97a417572be3443270260dff26625cc638d217 SHA-256: 4aefc69260a5da5a9c32b0cc69a487506abbb32e4d1a740df163fb3f94089b46
182 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, suggests a lure related to a 'vendor price comparison spreadsheet'. The presence of a call-to-action button and instructions to enable macros further indicate a malicious intent to trick the user into downloading a payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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
  • 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://crophysi.ru/strik?utm_term=vendor+price+comparison+spreadsheet In PDF document text
    • http://zawugudumi.getenjoyment.net/mufiwemurukizegit.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/hdjcScs/sonic_4_episode_2_hd_mod_apk_aptoide.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/hbjj2hd/mi_a1_launcher_apk_download.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/5_languages_of_apology.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/itRhfvI/vulalulus.pdfIn PDF document text
    • http://vejawezodasupax.22web.org/bikhari_julfo_ko_sajane_ki_song.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/MDhfrgc/8785332226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sorogamat/eternal_palace_first_boss_guide.pdfIn PDF document text
    • http://sozizuw.rf.gd/al_quran_karim.pdfIn PDF document text
    • http://rezumasalimod.epizy.com/tecnologia_da_informao_e_comunicao_definio.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/64213554310.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/clinical_laboratory_science_review_a_bottom_line_approach_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/nalotoloruwulikorub.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/categories_of_chemical_reactions_worksheet_answers_chapter_9.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/bldc_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/96278781185.pdfIn PDF document text
    • http://vefazuxugog.rf.gd/free_responsive_college_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/auditing_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/kulazeselase.pdfIn PDF document text
    • http://lupemuvuxetamok.epizy.com/spanish_2_midterm_exam_answers_edgenuity.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/jibikadano.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 5248 bytes
SHA-256: 6d820afece23fc1f9da62c9dc06bc253f80cb5529586329988bac70b7c88325f
font_01_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10304 bytes
SHA-256: 70aef1f9229866a68b56500c10f0976d7a7d6b252d5654984dc084e7cc09cce1

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