Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd86e4ae056477bb…

MALICIOUS

PDF

69.1 KB Created: 2021-02-08 17:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0289428d23c227d0f210d72da4541dc8 SHA-1: 843ee025e82ad5ccc178f4bfe0e203fd6cb6f413 SHA-256: bd86e4ae056477bb04f0bb8816fb2a0f1e11ff9e9864d8eb916dcf8a6cb3735d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=website+opslaan+als+pdf+mac PDF link annotation
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/supabenorela.pdfIn PDF document text
    • http://iranianvc.com/toon_blast_game_cheatsdc99i.pdfIn PDF document text
    • http://vezdesami.ru/gitlab_documentation_style_guidepqb15.pdfIn PDF document text
    • https://lonaxixa.weebly.com/uploads/1/3/1/4/131413275/2122385.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/nIxjhgi/dark_forest_background_4k.pdfIn PDF document text
    • http://liketime.online/mekivilubewedatexugeciorw.pdfIn PDF document text
    • http://kizefet.iblogger.org/1672461876.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/gamuzaxepobozugef.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/miravox.pdfIn PDF document text
    • http://brumbum3.xyz/suluvifikemimakasojigjs1rc.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/gazijewevan/nonigavafitud.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/91288738123.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/longitude_and_latitude_worksheets_2nd_grade.pdfIn PDF document text
    • http://gemesiwexalizel.epizy.com/85442065133.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/cerro_gordo_county_sheriff_report.pdfIn PDF document text
    • http://taroxul.epizy.com/pezitamulotu.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/verizon_yahoo_mail_settings_for_android.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_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 5356 bytes
SHA-256: a3f566140a4f261cbbba43a495d6ef86be677b5d9237c7bb498ef9494d53cdfa
font_01_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 10460 bytes
SHA-256: 0c4801c9d4069fe0cca17205b4d6085de06bf43c08e7e5524b2091df35b07960

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