Malicious PDF — malware analysis report

Static analysis result for SHA-256 b741fa0cebc8f9fd…

MALICIOUS

PDF

73.2 KB Created: 2021-01-16 18:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 85cc72ea2fdaca069d806b9bd83f12c4 SHA-1: ed670e8d7dd510ccf06652be35ff6c1ef107080c SHA-256: b741fa0cebc8f9fdb0cbf0a13e95b08e10be6ab9945c59e5d0ac4aaf062e0730
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for redirecting to known malicious infrastructure. The document contains a large number of embedded links, many pointing to external PDFs, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier output strongly indicate a malicious intent to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=download+rogue+one+4k In PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/009f684.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/gofanagizojipukigorotugif.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/relawovapoxem_fumifi_repazimegelaki_rebefojosiba.pdfIn PDF document text
    • https://movidotibapokab.weebly.com/uploads/1/3/4/2/134265591/sanimibi.pdfIn PDF document text
    • https://gakuzelidojipo.weebly.com/uploads/1/3/4/3/134395763/nidovonet-wuvakegoxa-fenupixok.pdfIn PDF document text
    • https://nuvawusop.weebly.com/uploads/1/3/5/3/135302159/7363750.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/pewebopufupe/widuxovipezos.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/ubuntu_16._04_command_line_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/bawal.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/best_weather_radar_app_android_australia.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 5060 bytes
SHA-256: 0eacca077b04e8201bd2e297c87532c557042bd7b6444b6a6ec8d945ff7a4409
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 11732 bytes
SHA-256: f64f492fa4fab6bc358c733d12da6173fe7477d69ccd542258acc53ae02d5bab

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