Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5df1474d4bc23b5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 00:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 03593b4ec20e9963bd5b6310a7a24620 SHA-1: 1b7e210d6df87959281bd9238f48bd10447d9a5e SHA-256: b5df1474d4bc23b53efad7ae83262bcf58ab5675dc505e5f4693bcb06ce42166
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 0.9997

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://nipisod.ru/123?utm_term=america%2527+s+test+kitchen+family+cookbook+pdf PDF link annotation
    • https://cdn.sqhk.co/livulopo/fqMO03x/guzugusovazimopetobip.pdfIn PDF document text
    • https://dufebekeromodi.weebly.com/uploads/1/3/0/7/130776386/8864006.pdfIn PDF document text
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/c949a773.pdfIn PDF document text
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/mevepomaruxenuzasef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_60513df186e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_601c946a12a83.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/0758d7e50291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5fe527bfa880c.pdfIn PDF document text
    • https://cdn.sqhk.co/rinulazopun/dThfjf7/96785942149.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/PiaZiKo/gonijuzuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/jXthbxi/65081317372.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/3a07bda4-a0fe-4834-b497-bf90604866b7/gogutetexavifipaxamen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6065f2-c769-45e4-9e7d-1baa3b9e2584/what_are_the_different_types_of_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7a0abb-cd84-4fed-8ae4-1b533d987b21/zexumazujo.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_6aa849cbca2e47fbb0859fea702ae0cf.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_207d54d5c51d49379943cb27fe227eaa.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_f0cd18bddd03476fae3d56e7fc0ddc45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f4a494-0ba6-4daa-8f55-e18e02e1f27d/javefemuzunikemititojemel.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_d31cce4f6c6945f4b33a8e8ef983b995.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/911c9148-e217-41f6-8f77-915877678fee/2452132411.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 5724 bytes
SHA-256: 3d62f19f575bd1b46921d6563b2990cd24814f603429e89684fb39a9f3ba8741
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 11000 bytes
SHA-256: 77bd783f23535224bfe35cf8b5b7d9b6399b1c8b0c48a4fd34578c59c5a95cc0

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