Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e0135ceb1b5a13…

MALICIOUS

PDF

89.2 KB Created: 2021-04-02 23:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75412722c343a97d5b761ad09ea673e5 SHA-1: e4d576d49134a00f5da818bd9293c7819a8c04b9 SHA-256: f4e0135ceb1b5a131c8e436f9196c7f93eeefa5246e35579dedc892b44502b95
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=south+african+cattle+breeds+pdf PDF link annotation
    • http://ita-yog.space/51446062516rvpq9.pdfIn PDF document text
    • http://beliyden.xyz/53647050386d1wzi.pdfIn PDF document text
    • http://grizhoff.ru/how_to_fix_usb_flash_drive_not_detectedp689o.pdfIn PDF document text
    • http://xenuven.22web.org/kalafumu.pdfIn PDF document text
    • http://reduslim-eu.site/77303105174axpdt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_6066a0a5e8b75.pdfIn PDF document text
    • http://jikifikizipi.22web.org/sears_1_2_garage_door_opener.pdfIn PDF document text
    • http://jakartapro.xyz/2270955024435ek7.pdfIn PDF document text
    • http://gazzsheff.xyz/tinkers_construct_guide_sky_factory_4xr9ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5fee3fee4ae03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_94ad54819b634e71939015e649f17b71.pdf?index=trueIn PDF document text
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_38c96824a0b54095ad0f1a69dcf7d268.pdf?index=trueIn PDF document text
    • http://tadabafilebe.epizy.com/jovovu.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_0b39eaf77d6a4903aaa7b46a695453e8.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_a230aad4ac9b409fb77c0dc57d25fc02.pdf?index=trueIn PDF document text
    • http://wodasakuzetu.rf.gd/35669089354.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_c75a20f8a17144ddbc965f3cc756cc89.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_76b548870a4c49099de6a0c97f0b25f2.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_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 5488 bytes
SHA-256: 7fa3bb0fc9193321a37c252baead502d3dedfccda0004d43b45cb8b5f50ce5ad
font_01_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 11808 bytes
SHA-256: abb3e504049cf0e943fff015f4e4546feb4eb4653530bf117a276d2285284c69

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