Malicious PDF — malware analysis report

Static analysis result for SHA-256 660ff45a4a4efa8f…

MALICIOUS

PDF

72.0 KB Created: 2021-03-19 21:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c647732f22b6697c01eea6f61d1f3b69 SHA-1: 8bdf9621cf3748143d1e96e758a6b07166d79de0 SHA-256: 660ff45a4a4efa8f16c7ff006a449412cc513820e95f0e16dec16ca2c9c03ba1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a disposable hosting service and another to a domain associated with phishing. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/123?utm_term=clauses+and+phrases+worksheet+year+6 PDF link annotation
    • https://cdn.sqhk.co/wifopuzuxiba/f5BtggS/81492799555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_603421071800a.pdfIn PDF document text
    • http://creditscorecard.info/critical_hit_deck_pathfinder07n4v.pdfIn PDF document text
    • http://lesantyqas.online/7654425823biczj.pdfIn PDF document text
    • http://shopyou.online/vuxagirefasony4vte.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/idPjfyZ/super_smash_star_fox_mechanic.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/jbIjgVD/97963468809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5ff29fde8c92d.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/6JuidY8/kung_fu_serie_zitate.pdfIn PDF document text
    • http://idealslimitaly-official.site/jopaseloxuv2rto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fdc633c90e38.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/UieDhaw/hustle_castle_wiki_armor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6042e0ae0099b.pdfIn PDF document text
    • http://karnaval.host/the_use_of_elements_of_arts_in_the_egyptian_sculptureed48g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382772/normal_60032d0f96c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_60212bfeb8b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_601d2caa40bc6.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/wonumafubij/32185921007.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/28265878527.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/principles_of_risk_management_and_insurance_14th_edition_isbn.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/invoice_template_for_openoffice.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/39443942171.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/vusoredopupi.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 5364 bytes
SHA-256: e2666836a2a6331208a89873e8ec62633abb7c7f94b86c8f4b249013e0753435
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10484 bytes
SHA-256: ca00d720987be94fe87e1784cf30bf6c7f530dcb4664fcb5c0818a8273190408

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