Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cf2463ebb914e8…

MALICIOUS

PDF

80.9 KB Created: 2020-12-17 16:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bc06c026f647dbed90c8a9a42675fa48 SHA-1: 79b8f8044a3971de861d713497a000832328400a SHA-256: 53cf2463ebb914e893055b04d84698bbddd246e3badbb19215bc2d2d6e61a1b9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with the primary suspicious URL being trafffi.ru. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious classification. The presence of embedded links suggests an attempt to redirect users to potentially harmful 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://trafffi.ru/123?utm_term=saab+sf+340+turboprop PDF link annotation
    • https://tataberoxem.weebly.com/uploads/1/3/0/8/130874397/9946159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f969dad6a86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5fbfb358c1d71.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/1036432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5f9347a2a05d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fd280b83f080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99a0a2757459be2ef6a/t/5fc0f2483f75b16643f60b77/1606480457575/jewemiferazikido.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/the_industrial_revolution_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d32e47-4029-4eef-bc38-a94965175207/class_of_2020_shirts_cute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec889c2f-5b06-4a62-beb5-2b192d5f8439/survival_analysis_techniques_for_censored_and_truncated_data.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/7th_grade_math_problems_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/simbolizacion_de_soldadura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2520ad95-1157-481d-aeb0-7eab500ce347/wipibu.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/ifunny_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e16473b-3722-4e8b-9d1f-8b7250713589/juxevufo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe04f318e72e5fdb9d98dc/1606288628157/nobixidekuwizexoza.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_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 5500 bytes
SHA-256: 7c21e12a2fd7350f1262310dde87876035488703a455bd001cc2e513ef981cb0
font_01_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 11504 bytes
SHA-256: 409ee0ba923d26aa7812d8e798728ac8639768594f7b1a4e901f9d7c0040a929

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