Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42b25b2b1a551d0…

MALICIOUS

PDF

68.9 KB Created: 2021-04-01 14:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ffbc820c60fa693467a35c67443a1888 SHA-1: c28a1ad1ae284ada639d495fc55bf4b88e28c64a SHA-256: c42b25b2b1a551d0ebbe3d989f68648aca9e78da4bf1637907ec13db99ae15f3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs indicates an attempt to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/award?keyword=aceptacion+social+pdf PDF link annotation
    • http://shopsmmv.site/74612598788oq6i.pdfIn PDF document text
    • http://juladolagu.iblogger.org/nafuponuwepavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_6054594ca9c2d.pdfIn PDF document text
    • http://loveworld.club/jolewuviyso3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_602ba2d09505f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_5fda0f1b90f3b.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/sql_server_2017_developers_guiderb7fp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_603ec0d0c6287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_605d65b3483c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd26ba781292.pdfIn PDF document text
    • http://zajowidased.iblogger.org/drawing_application_for_pc_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fd333fd71663.pdfIn PDF document text
    • http://pitushok.space/19709358025oy4g9.pdfIn PDF document text
    • http://lakabusomasa.22web.org/a_feast_for_crows.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368984/normal_5fe49555dfd78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_601ad420e5a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_600b2dbd863c8.pdfIn PDF document text
    • http://chambrehub.xyz/89232825486gmt4p.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/dudujopixejikug/what_is_considered_a_broad_statement.pdfIn PDF document text
    • http://sojefebil.rf.gd/reading_practice_for_ielts_general_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/personality_adjectives_esl_worksheets.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/52638642325.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/9_certos_administrao_de_medicamentos.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/apple_local_and_remote_notification_programming_guide.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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 5040 bytes
SHA-256: 7ea687a467c09b784c16066be8d1a8ad5be286b8ea1b7a6b1009a88916565d62
font_01_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10280 bytes
SHA-256: a015cbf37726f3d3dc14a326fd34322ffa08fdd9eeea717984fb68a607938388

Open this report in the interactive analyzer, or submit your own file for analysis.