Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ef2ee7a6eb5d8f…

MALICIOUS

PDF

81.3 KB Created: 2020-12-25 14:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6776b62c329bcc4458c92a184deeb987 SHA-1: e7e2351005b2f37c735262f11775dd324893322d SHA-256: 05ef2ee7a6eb5d8f82790d70d2c0034d0a80ec6149a934ecabd7c39fdbcb6230
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to attract traffic. The primary URL, 'https://traffset.ru/strik?utm_term=xbox+series+s+amazon+prime', suggests a lure related to popular consumer products to entice users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is weaponized to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffset.ru/strik?utm_term=xbox+series+s+amazon+prime PDF link annotation
    • https://wajatajosow.weebly.com/uploads/1/3/4/4/134487766/9632394.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/0a6ea1a4.pdfIn PDF document text
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/sixosutesaruviw-wujar-buliba.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/vimelun.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/466d53b6bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_5fd1a8e4b7ce8.pdfIn PDF document text
    • https://bozozojiretul.weebly.com/uploads/1/3/4/7/134770512/fibaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tesapibebujep/zovutolo.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/digital_aircrew_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/wawimojopeb.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/77888412097.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/realidades_3_prueba_p-1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe47a04-7336-4900-b9d1-211012c4ac7d/fake_cardboard_fireplace_decorations.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/minupelelomaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 4876 bytes
SHA-256: f927df51aff43e015d48cb81d19f20a7888b4307b612ac2140f3270bac8844d4
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 10900 bytes
SHA-256: 99e87b713107a039adc3fe9f8902c5ef7a55a4e1938ad59a640f5055f130759d
font_02_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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