Malicious PDF — malware analysis report

Static analysis result for SHA-256 89acfb23f23945c6…

MALICIOUS

PDF

116.6 KB Created: 2021-05-13 11:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9280bf93c501b9d6952551f9f199649 SHA-1: d84a368ca570b899520eaa823fa0849c0e394946 SHA-256: 89acfb23f23945c67e3002ab04e2044944d071f7bd07611a6499cc9323ab84c3
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 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

  • 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://vilenefex.ru/strik?utm_term=romantic+fantasy+books+for+tweens PDF link annotation
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/nujunig.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/b9jaUru/kung_fu_panda_3_movie_characters.pdfIn PDF document text
    • https://rudarizegofuk.weebly.com/uploads/1/3/4/3/134355262/nidoloxolo.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/ihu71jb/sivufafabu.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/770ce0ac8579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_60673ef0803be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_602126bae0b15.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/kogox.pdfIn PDF document text
    • https://cdn.sqhk.co/samuxoruja/m6Kua4Y/kosuxonarorunexifal.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/1399701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_ae1e344ee1b742b39cf527f965a5906f.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_746fd6ed832b456d8d3359bec458d90f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68064ca1-8b79-429a-ae41-c4fef5abbae6/97844754249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f59bdf-0adc-4f35-831d-7cb2930e3521/86884230837.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_a6c47c252cd4413eb39180a225042023.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_8776d502943142b2a2850dcf87609952.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b3f6d6-be9c-465a-b3ca-088bcf7a6ae6/wowilatebezawugap.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AD8 5400 bytes
SHA-256: 645a12fea33628e3eb0cc3bbe1af88f36a53b604f63be5a4e798d5b68bcd2de9
font_01_sfnt_off00019d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D3E 11520 bytes
SHA-256: e7d70f99312eb970d59412e84d3a80db75455086b8344480934781f62ec112ee

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