Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71954c57cea5342…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 04:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d3379b203884cbade385368188e42168 SHA-1: 9ec2511aaf4d268988159ca25ad89d7e535f96dc SHA-256: a71954c57cea5342768093dc3b8a231de7bea13f7c85fac635eec28b577406b5
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://zajinet.ru/strik?utm_term=what+is+a+latent+opinion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408997/normal_602513fad52ae.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/fotadizo.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/dazopuwerijopugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fe062ecdc384.pdfIn PDF document text
    • https://lututigit.weebly.com/uploads/1/3/5/3/135335707/9e6748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_601fa988f3d43.pdfIn PDF document text
    • http://topsale.pro/successive_ionisation_energies_worksheeta31p2.pdfIn PDF document text
    • http://1-bog.ru/do_nail_salons_take_walk_insypkc1.pdfIn PDF document text
    • http://trysoda.club/guxedovemobifedigimoxz5sh9.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/1294200421.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5feb689a82b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_6018d7615c43c.pdfIn PDF document text
    • http://elerctum.org/796427645200y8sa.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/is_the_killing_on_netflix_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_d21bc89c028643c28ad490d6ba1e9b99.pdf?index=trueIn PDF document text
    • http://gonegexunu.myartsonline.com/dapetorume.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_01cbbddd4f0b430fa71c759537f84c47.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_c90f7747f2cf483aac756e8e714a8bdd.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_a44f56344f484e69a5119ae20af81fd9.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_27b2fc59d6b54c91bcf3fb9dea140397.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_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 4824 bytes
SHA-256: 5ea141a0b20c847b806f9711a36f66f201283c4b5b5f766ca3a431306f344d4b
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 11460 bytes
SHA-256: f798c23faf6e19baff6cf7c65e83c6332a21f87106fc0c0f6abf98e2281a2d77

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