Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15f3fc0132abf78…

MALICIOUS

PDF

80.5 KB Created: 2021-03-24 00:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 50e7997cbd78c3724bbf87ef81b9a8e0 SHA-1: 58bc0c44abb0a9ebb2fd4d16f272af9bbe9f6d9f SHA-256: c15f3fc0132abf7824b140dd5a1aaf5fcee77d48872a8ea43b584fe3bd63322a
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 0.9997

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://nipisod.ru/strik?utm_term=top+200+drugs+list+brand+and+generic+pdf PDF link annotation
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/jalivesid_kifuxik_lukadef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5ff7fe387a922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6042f48ae51d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fd676998ad7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_6026f95406101.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/4169694.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3a2904-4e81-43f5-a08d-0ee68a825232/36248675245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1341bf-c5eb-4b6f-a3d7-325ac4ba7b8b/fapaxadaj.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_d5ece7eea80f47539f86555612d231de.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_19b21c365a7348ce867a99c5bd836ae1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/787f0ac8-7832-4fe4-9b62-607b05462709/how_to_create_a_shadow_puppet_theatre.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_9cebc1a66de64715b06520ea03084dea.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_72c26f4074f948e394a4eb89890ae233.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_fe4b7d4811d840d186b655361f13cdf6.pdf?index=trueIn 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_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 5688 bytes
SHA-256: a1ba49924f8e29dcbff46e1a704474452b351943e8acef8e2db5780184a9f404
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 10604 bytes
SHA-256: 6dc631f163af4dcfac8a1bfc873ebc4123fea4bffbb775ab5ad8daf627c47c06

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