Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c8bd75ea4d4ab2…

MALICIOUS

PDF

73.8 KB Created: 2021-01-13 04:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 09004fda911a697edf469593df73b593 SHA-1: d6f099da1e0b6ff9451ed73c7a2a21832512f88e SHA-256: 00c8bd75ea4d4ab2b8a59c5ee31a7278a5c91e66b9b46bc48de0d596dca4ad6b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and embedded links suggest it is designed to lead users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://traffine.ru/aws?utm_term=conductivity+of+strong+electrolytes+lab+report In PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/miwowufamurid.pdfIn PDF document text
    • https://site-1166595.mozfiles.com/files/1166595/48810728832.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/4f141e4367aa46.pdfIn PDF document text
    • https://site-1172223.mozfiles.com/files/1172223/81689705079.pdfIn PDF document text
    • https://site-1250415.mozfiles.com/files/1250415/acknowledgement_sample_for_survey_report.pdfIn PDF document text
    • https://site-1168354.mozfiles.com/files/1168354/10152766614.pdfIn PDF document text
    • https://site-1173313.mozfiles.com/files/1173313/21615558118.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/chiW58w/smartthings_plug_not_responding.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_5fb59e74ee6d9.pdfIn PDF document text
    • https://site-1243289.mozfiles.com/files/1243289/biology_book_12th_class.pdfIn PDF document text
    • https://site-1203255.mozfiles.com/files/1203255/indefinite_pronoun_worksheet_for_grade_9.pdfIn PDF document text
    • https://site-1178342.mozfiles.com/files/1178342/dragon_blaze_mame_rom.pdfIn PDF document text
    • https://site-1174958.mozfiles.com/files/1174958/background_eraser_app_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fce14be00435.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/ogeRMji/clueless_characters_costumes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 5528 bytes
SHA-256: 1d923fbe6da9023cca2f382e482cb3d68bf54b39c391fef80484e53b63a9a8f5
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10876 bytes
SHA-256: 886c788e60e3800eae4e00affdc0707b1f79cdb4c4d9b84287a5f66a43fc9c0d

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