Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca31386285e0376e…

MALICIOUS

PDF

67.9 KB Created: 2021-03-25 10:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ec79c1f6c4be98e3d112d8dc85749ff4 SHA-1: 99c813dab0588aecb628ebd0c2c154c5998be60e SHA-256: ca31386285e0376eca9f8dc4e2eb629e9571cad1581593efd98b5a69aabc3e10
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm or SEO manipulation scheme, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The embedded URLs and the ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect the user 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://druttle.ru/strik?utm_term=bottom+clean+fish+farming+pdf+in+bengali PDF link annotation
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/a7f97ec6420d5d5.pdfIn PDF document text
    • https://funobijego.weebly.com/uploads/1/3/1/6/131636789/3152b39e206ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ff71a457c204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_5fcf4372bf41e.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/cylinder_surface_area_worksheet8y8wy.pdfIn PDF document text
    • http://closemaze.com/92519070310xfe6j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_6012db4765a25.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/wipupodalo.pdfIn PDF document text
    • https://bogizironafek.weebly.com/uploads/1/3/1/4/131406395/6535143.pdfIn PDF document text
    • http://xedowoduwonaf.iblogger.org/what_are_the_5_ethical_standards_rics.pdfIn PDF document text
    • https://xizidedatisaxos.weebly.com/uploads/1/3/2/3/132303240/6723309.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/zetubakuz/princess_aerocraft_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/kasenojuwonolibitare.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/addition_with_regrouping_for_grade_1_worksheets.pdfIn PDF document text
    • http://zewuxulaza.rf.gd/negative_prefixes_adjectives.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/dragon_nest_sea_mobile_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/17985696835.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/marc_rivalland_on_swing_trading.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/brand_awareness_questionnaire.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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 5760 bytes
SHA-256: edec8be42afefbaee2d682a324a358f1c5e83715d3d58525cc921d2e23dbfea3
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 9900 bytes
SHA-256: 03185cae0a1bb98609613734fd5e0cb5417c9958cb44379c397d36908d5dc35f

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