Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b94fb08c4af0293…

MALICIOUS

PDF

83.0 KB Created: 2021-05-23 15:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c75dcef197b27aeffd7c84ac5c106b62 SHA-1: 4015d94429306d260f55879fbf868fc1b0cc690b SHA-256: 1b94fb08c4af0293a3cdaa5563d5eb00772e556cf0947da943ad1c9cf0201849
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://vilenefex.ru/strik?utm_term=best+reverse+phone+lookup+free+anywho PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408858/normal_600fbcff4e416.pdfIn PDF document text
    • https://vikuxujawud.weebly.com/uploads/1/3/4/5/134515409/8518498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_602fec191c385.pdfIn PDF document text
    • https://fovozipi.weebly.com/uploads/1/3/0/7/130775458/2af4be56d06fadf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fd0a087ca347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_6067300f97b32.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/belunogawisig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5fc585fec9992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_60366ed72bc55.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/ditax_zusewix_kewunuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fe9d39d2dc4d.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/pituminanenigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xurixado/how_to_prepare_physics_class_12_in_2_days.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/fupurevenatutimigarojomu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/87351793644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73bc88d-686e-4ae0-94b2-4c066aa2f9e4/27464707574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d58d23a-20d9-42af-a6d5-d63bc8c4b430/probabilidad_y_estadistica_para_ingenieros_devore.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/bosson_one_in_a_million_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/bizalab.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/how_to_earn_credits_in_college.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_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 5356 bytes
SHA-256: 2d12e6b36b29bcd944c9298573292f8330b6797c6a2e8aace44fc11ed41f04f7
font_01_sfnt_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 11340 bytes
SHA-256: 0132f1852544cd6b611181fd1cdd126b018a2b6eeaf3dd9b5c9911a00f2bebcb

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