Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6030dbe4ca7bb79…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 20:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5d21a257a88cb39477f0a77c1971a8b2 SHA-1: 7373cc0f72be59d989a431ff7c6a4707b6092d1c SHA-256: e6030dbe4ca7bb79a154d31784992a521f9d755f31a5f3a9a34c830b6aa6bac2
134 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 and presents a deceptive download button. 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fundamentals+of+electric+circuits+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500187/normal_5fe908eb512e9.pdfIn PDF document text
    • http://mazezoda.22web.org/code_of_judicial_conduct.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_602bd98fcb6bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_6014784677193.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/43459519769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6034052cd1159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407313/normal_5ff593ec25496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416512/normal_5ff6a3d69f11d.pdfIn PDF document text
    • http://themarkuzmusic.com/88232876097dyryg.pdfIn PDF document text
    • http://zoomita.space/remazugz6kep.pdfIn PDF document text
    • http://sexedate69.site/nefomunujozn221l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451954/normal_600b68453e3a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_600556aa87ae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fccaad3cd33e.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/lisutatopodaturivup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407087/normal_60180e5c7710e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadoxosin.atwebpages.com/graphic_designer_salary_2020_usa.pdfIn PDF document text
    • http://gozosowizopuk.rf.gd/spiral_ham_recipe_oven_bag.pdfIn PDF document text
    • http://dukanoro.epizy.com/derechos_humanos_en_ingles_traducir.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 5256 bytes
SHA-256: 887f211e8ea3c1ac1b6f9c3d551523b7b50dfd7f0c1dff07aa3d902d5210fa56
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10740 bytes
SHA-256: e8b29587a3d3e661ab09ac3b09ce69ae4c1a1328bcc1d3dae4400b5559a4fc40

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