Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cd1fdd3138f67d…

MALICIOUS

PDF

71.9 KB Created: 2021-02-21 17:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2bcdc39b72688065d21c02ab622df314 SHA-1: 5ce4d53d4cc0431611cad323ac021d9d3e44fcf9 SHA-256: 66cd1fdd3138f67d0cd819aca4dc507cbd7afb3537cc1b20ff178f7a035d7e95
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=langlois+weigand+%2526+associates+inc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479710/normal_6023739f1e21a.pdfIn PDF document text
    • http://gufutaca3.xyz/85722600004ygm4b.pdfIn PDF document text
    • http://hookup153.space/biwuvuvovigutxiayu.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/iohcidm/kusivafegonerenexiwaju.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/WENjcge/55377561769.pdfIn PDF document text
    • http://afterdealer.pro/which_it_jobs_salary_is_highy1jvl.pdfIn PDF document text
    • http://itayoga.space/cartographers_heroes_kickstarter0edzp.pdfIn PDF document text
    • http://apeech.ru/como_cerrar_sesion_messenger_androidif18w.pdfIn PDF document text
    • http://heartcenteredequestrian.com/baadshah_video_songs_teluguqr5a6.pdfIn PDF document text
    • http://fly-drive.online/kimowupusitufatimesas8s4g4.pdfIn PDF document text
    • http://esclub.pro/le_argonautiche83sg5.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/jchh0if/80317447617.pdfIn PDF document text
    • http://garantiya62.ru/chemisches_gleichgewicht_formelnq28yf.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/guia_autometrica_enero_20205pnef.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/votuweroxigezog/jusitafi.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/xetosiwedo.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/kinds_of_verbs_worksheets_grade_5.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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 4932 bytes
SHA-256: b98c9e8efca8616e086062cc514e9eaeea91446701918a23bb61da76285c0bf1
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10348 bytes
SHA-256: a9d3c86b2f29424f65836c1aec6a19dc0ca5bdfe590680885ac1870b8510b359

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