Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dea60eb70e2e17e…

MALICIOUS

PDF

66.0 KB Created: 2021-01-12 03:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc4dc37c86eb8b13065cd794827e8ada SHA-1: 16900b391701c553505ad9ef1114bf8cf842bc85 SHA-256: 6dea60eb70e2e17e35cba4a214de46363bde47b829b662494907c21d094c7f05
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://trafffe.ru/123?utm_term=charlie+and+the+chocolate+factory+worksheets+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f88bdd95ac4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fce68d39dbc0.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/samsung_music_share_with_windows.pdfIn PDF document text
    • https://site-1168383.mozfiles.com/files/1168383/best_hollywood_action_movies_2017_free.pdfIn PDF document text
    • https://lemurowivavaxub.weebly.com/uploads/1/3/4/4/134404776/febijo_dusijola_pumoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421970/normal_5ff2f3837e9dc.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/AcFicDR/resadujawapatu.pdfIn PDF document text
    • https://site-1178487.mozfiles.com/files/1178487/xezekibonajonejugifoso.pdfIn PDF document text
    • https://cdn.sqhk.co/ludafojebi/icjgqr1/6325510738.pdfIn PDF document text
    • https://site-1198033.mozfiles.com/files/1198033/lymphatic_system_function_and_organs.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/rutim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f9ef7b013378.pdfIn PDF document text
    • https://site-1176846.mozfiles.com/files/1176846/baby_panda_hospital_game_download.pdfIn PDF document text
    • https://site-1172574.mozfiles.com/files/1172574/company_brochure_templates_ppt.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_off0000c68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68B 5272 bytes
SHA-256: adb0e97834b301d807c546d9c22ec15208e26f475392801e80cc6bc4cb42b896
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 10168 bytes
SHA-256: 350cf18372ccecd84ba9fce3d0163289df08d6315cfb4bd2bce876fa74423ece

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