Malicious PDF — malware analysis report

Static analysis result for SHA-256 8735f451d8c9bcae…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 07:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 30004a29c722f9567e87dea6b6a64afb SHA-1: ed977e6430555abb0fcb948b17fe392d0ea90119 SHA-256: 8735f451d8c9bcaeb90c417d16e020605ea85aa0c701488d485287c3906965f0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to mezovuduw.ru, which is indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://mezovuduw.ru/123?utm_term=cambiar+de+pulgadas+a+milimetros+en+inventor PDF link annotation
    • https://cdn.sqhk.co/vabolepibe/digFGsm/13749812715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_603712716a72f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_602c1f7f4bfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_601671c5815ed.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/74315e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff71817461d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452608/normal_5ff774fe140fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5ffaf06a89a7e.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/hjDEjf8/sepijalatitiwa.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/devuxuzejozam/free_download_twilight_full_movie_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/35856445461.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/hot_wheels_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/sharepoint_2010_checked_out_documents_report.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5384 bytes
SHA-256: 2f28ec615ed8af80a662467c5fe1b0e9cf7bb969e709e8842a2e2e9eaf756980
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 11760 bytes
SHA-256: 8a7b1602d7e7d6e8792bb1b812828f4bf1f0e18bfa142c98c55f57d858c55dce
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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