Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7d96be68243619…

MALICIOUS

PDF

75.5 KB Created: 2021-05-04 05:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f4e202f6213d2864b31315e43c23510 SHA-1: 173fe116f9a87d753e848598dadd94be81350b94 SHA-256: 2b7d96be682436198d9491d31a016c8d38439aa97d88bace4eac671d0c5d0e72
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://midufefew.ru/strik?utm_term=cuantas+razas+hay+en+el+mundo+y+cuales+son PDF link annotation
    • https://cdn.sqhk.co/bupewazadufa/gficnhc/mirror_by_lululemon_stock.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ejbGUja/download_game_wedding_preparation_salon.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/igijbhi/ipad_multiplayer_snake_game.pdfIn PDF document text
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/1764530.pdfIn PDF document text
    • https://torufiwatus.weebly.com/uploads/1/3/5/3/135312416/d712b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fca8df2a9fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6029c6df8d627.pdfIn PDF document text
    • https://riragipus.weebly.com/uploads/1/3/4/3/134358734/guzawer.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/071172b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_6023f31076099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_60187baf32f72.pdfIn PDF document text
    • https://rekeboko.weebly.com/uploads/1/3/4/8/134899800/mewujoxamil_suxabopuwu_misorelajir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_5fea0e0b26e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_601b54d6ece1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_1e51418181394dbd9a1f184fc60b089f.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_ab8e22719ad94cc8beb9deb8762d1088.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5236 bytes
SHA-256: 45f9b4bd36396efe8749a039daac66057b544368db4a5fafda593c1a759678b5
font_01_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 12328 bytes
SHA-256: 36256c15e726f8b13a30c20fd4217957470eacd5aaba6f885861c7846bb283eb

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