Malicious PDF — malware analysis report

Static analysis result for SHA-256 3760845f3a54d403…

MALICIOUS

PDF

71.2 KB Created: 2021-06-06 16:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0a0fc25a6b5473ccf2ed4890dc9eef8c SHA-1: 87962ebc5e1c9c5f74c0b6b103ce471fd1a08bc6 SHA-256: 3760845f3a54d4033e8e1d6215dd2bc5270fc285364d8f887895a7fe5b0a710b
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the PDF is designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL usage point to a phishing or malware distribution attempt.

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://inwebjor.ru/pbw?utm_term=sexual+and+asexual+reproduction+in+fungi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487888/normal_60104a5378385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389601/normal_605bb94aab95d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fdfb48bf20ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490273/normal_60322b27e3869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lururefisu.pbworks.com/f/50541780428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afab7fd-04f8-4d0d-abb4-8244e54c3fd9/writers_choice_grammar_practice_workbook_grade_8_answer_key.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/duzilizodudetoju.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/99443948189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501960f5-4145-4807-abb1-2c4f7a8b75e2/small_business_management_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09833359-8c4c-4801-91f0-fc01b2b98f4f/68238317629.pdfIn PDF document text
    • http://guzopisuw.pbworks.com/f/how_to_claim_centrelink_benefits.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/77301302483.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/cuales_son_los_sntomas_de_ansiedad.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144423540/recommendation_letter_for_kindergarten_students_examples.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144454581/cursive_handwriting_practice_for_adults.pdfIn PDF document text
    • http://fozujedax.pbworks.com/f/cuaderno_anatomia_para_colorear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2bbcff-7d58-40ce-99d1-cfd14041ecf5/sopatuvaragaduxibatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373c4e55-1565-45bb-a2f0-534250385245/heyday_bluetooth_headphones_not_charging.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/46688792159.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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 5496 bytes
SHA-256: 47f7382f3bdc0d930071e7da60db62c34796e4ec06f1b701ac3df56d59e87462
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10432 bytes
SHA-256: 1ab80585cde84338a4478cbfc264738475775618e6978292d10d8498c132cb3f

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