Malicious PDF — malware analysis report

Static analysis result for SHA-256 586385447d21afd2…

MALICIOUS

PDF

85.2 KB Created: 2021-03-28 12:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: db0baed5796d09f6c718d7a06600856f SHA-1: 16ad77e14b465c92501ee6acf854313fdbc06768 SHA-256: 586385447d21afd25caad0705f8cefe7865eee07ebf8da08fdc64fc3d9624169
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/award?keyword=cambridge+english+test+pdf+b2 PDF link annotation
    • http://indital.space/how_to_be_a_successful_medical_laboratory_scientist_makep80ze.pdfIn PDF document text
    • http://joridasemif.22web.org/mainstays_3_shelf_bookcase_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fdc2c160d89b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418788/normal_5fc7e442a30e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_6054f6ee1abb5.pdfIn PDF document text
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/eea4139e0ac.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/4607489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_6023ea35c8540.pdfIn PDF document text
    • http://dressnbuy.com/self_laminating_sheets_cvspq04h.pdfIn PDF document text
    • http://mini-cam-v2.club/evolution_2001_full_movie_123movieshcezg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fibesezati/paternity_leave_rules_in_india_for_central_government_employees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade163b1-797b-4adb-993c-6b9cf41425ac/difference_between_highly_sensitive_and_hypersensitive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5ad851-d0aa-4588-ad20-399ccb125f90/97416184087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccb59c2-d6bb-4400-882c-14e0abbcc867/wokuvarobepojogotem.pdfIn PDF document text
    • http://rewojemod.rf.gd/automobile_parts_details.pdfIn PDF document text
    • http://felawikemuda.epizy.com/cambridge_university_email_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/pokati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476289dc-cb6b-41f9-9b12-4ac7e08c95d1/can_you_save_garageband_files_as_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/79700804016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 5428 bytes
SHA-256: 82dd4501a85bb06114718d1365cdcf3b7f34d5a9ad6f1d30b428099f78741549
font_01_sfnt_off00011313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11313 11392 bytes
SHA-256: c54e5c83bc0bfbeb0ed144d46f155cde7b532cb799adcda2b0edf26dfac9e4fc
font_02_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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