Malicious PDF — malware analysis report

Static analysis result for SHA-256 de774ef13af4a3de…

MALICIOUS

PDF

81.8 KB Created: 2021-03-15 23:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bfa05eb4e7419d278c6f78f69c1b0cc3 SHA-1: 0aea06ee01b40bbe5302b795972ada36afb153af SHA-256: de774ef13af4a3de022e203c73a3529fc6eb4d338daa7da9b9ac4d694467ceee
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to other PDF documents, suggesting a link farm or redirection mechanism. The primary external URI, https://kuzutuzo.ru/strik, is likely the initial point of contact for a malicious payload or phishing page.

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 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://kuzutuzo.ru/strik?utm_term=heavier+than+heaven+pdf+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387571/normal_60365e8a2b731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fea151318c3d.pdfIn PDF document text
    • https://cdn.sqhk.co/bojesave/7jenBFC/axis_mutual_fund_re_kyc_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5ff2ab5c63178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fe9f3e0c64b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403417/normal_5fc7740ecdc4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480750/normal_6013e2d7c89e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/fzgcBhd/employment_verification_letter_for_spouse_visa_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_6039fe5ac7196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456393/normal_5ff9eead24d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5fd84a7a31b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fea189a57782.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/divelatoxa/kodoxotinufoku.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/internal_auditing_assurance__advisory_services_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/38349754297.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_74b35d6f6d034ac0ac6c1768023f7dba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropiw/mcculloch_mini_mac_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/79941786668.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_6b04a74cf5904badab608d9a001cd2bb.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_7b72a9788a5146019a2e4afe69b47397.pdf?index=trueIn 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_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 5324 bytes
SHA-256: 5081ac7500c0321835e8873ec1eadecc792d634df90847bfece5f651dc24b78a
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 11516 bytes
SHA-256: 8ee5789930d9e509a064115d78590054db81ae4de300282da20210a2657def7d

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