Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3236fb86fa4b70…

MALICIOUS

PDF

76.1 KB Created: 2021-02-27 12:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d1e88ce9fe2ea37b600060b8b1dd9dd SHA-1: ac9d31821f90103640c8a0ce8d7d3987a8457772 SHA-256: fb3236fb86fa4b70e1fad6c9e29ed8c541e45b9ee33df468cd3b1656199e6256
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=los+crimenes+de+la+calle+morgue+edgar+allan+poe+resumen+corto PDF link annotation
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/rojuveg.pdfIn PDF document text
    • https://lonirukigosoz.weebly.com/uploads/1/3/5/9/135965403/jotirupanupa.pdfIn PDF document text
    • http://mscgis.net/67993464725s8be3.pdfIn PDF document text
    • https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/jejaxebokiwud.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/3551845.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/de8f57beca089.pdfIn PDF document text
    • http://firstreadersclub.com/wuwowenum364y2.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/bematupafen_lapolexa.pdfIn PDF document text
    • http://ergors.space/siderdc9jn.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/xerutaletaw.pdfIn PDF document text
    • http://ig-objectionform.com/91356129933pjtwl.pdfIn PDF document text
    • https://jofukesor.weebly.com/uploads/1/3/3/9/133999831/323119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitafefisoju.atwebpages.com/diploma_mechanical_engineering_books_download.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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 5332 bytes
SHA-256: f245271d1d5168ad6bea4936dc3faf312f68b52ad5a40ae1df22a271ee486e13
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10924 bytes
SHA-256: 80e3b20162445b07333e9033768f57736ade6b523ed6ebdcfbd21e06cb905737

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