Malicious PDF — malware analysis report

Static analysis result for SHA-256 233d20f5640ae4f3…

MALICIOUS

PDF

72.2 KB Created: 2021-01-22 01:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3414487d12e36bd43f7ec98a56a2c7b0 SHA-1: 64b295495add2bf7b0dbba993878d08256044db8 SHA-256: 233d20f5640ae4f355e61c5ca06ca9c62fe93bbec49c46327c4dff423e3a1a1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for phishing and a high ML classifier score, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=salem+witch+trial+lesson+plans PDF link annotation
    • https://site-1219243.mozfiles.com/files/1219243/39955422499.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/1222027.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/bhahagd/guide_for_aquapark_io_game_unblocked.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/sulifopisulowodejoz.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/how_to_become_a_prayer_warrior_book.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/8883471.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/ijiLxEA/67081827458.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/trash_compactor_manual.pdfIn PDF document text
    • https://fukaxoxatu.weebly.com/uploads/1/3/1/4/131438517/608e4afe0.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/agjL7mC/zero_gunner_2_classic.pdfIn PDF document text
    • https://site-1168276.mozfiles.com/files/1168276/zusazuzosejuzefut.pdfIn PDF document text
    • http://bebolekuku.22web.org/charles_county_sheriff_crime_reports.pdfIn PDF document text
    • http://dobujebenebif.66ghz.com/7235923467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumusijejokezit.epizy.com/oblivion_astor_piazzolla_sheet_music_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/craniocervical_junction_malformation_radiology.pdfIn PDF document text
    • http://bopufadepop.epizy.com/format_xml_sublime.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/msi_afterburner_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/ip_tool_wifi_analyzer.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/ischgl_snow_report_14_days.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 5368 bytes
SHA-256: 96998c6de3304388759016ca5fc406d2fcc75d6ccc70f141b6d1f9a17837b213
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 10908 bytes
SHA-256: b62fb00794b0b329f9c1762f5d97a53eb03207143081b8a4194d88cea19db4a0

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