Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56cef5b50d69ffd…

MALICIOUS

PDF

74.5 KB Created: 2021-01-11 08:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7f577d54900a9226d4cb18d01744ab34 SHA-1: 70fd74d55a4b91001dc2bc15d40eb540e231c326 SHA-256: c56cef5b50d69ffdc9ed3082047f3b47e1584c9b65373c48f97bcd404cb0b2ef
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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://gettraff.ru/aws?utm_term=tips+to+answer+abstract+reasoning+test In PDF document text
    • https://ratudagusamidux.weebly.com/uploads/1/3/4/6/134692006/rizejujinux.pdfIn PDF document text
    • https://site-1173463.mozfiles.com/files/1173463/hku_food_and_nutritional_science_syllabus.pdfIn PDF document text
    • https://xejibojap.weebly.com/uploads/1/3/4/3/134310503/tubibes.pdfIn PDF document text
    • https://site-1176160.mozfiles.com/files/1176160/gluten_free_cake_decorating_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/gjgu0vm/syrian_hamster_lifespan_albino.pdfIn PDF document text
    • https://site-1168326.mozfiles.com/files/1168326/nc_teachers_assistant_pay_scale.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/legobegutulo/calories_in_sheet_cake_with_frosting.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/adobe_audition_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/ferobop.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/number_line_addition_worksheet_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/virimanagaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/chiari_1_malformation_on_mri.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_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 5252 bytes
SHA-256: 6c965a8f42aac0384d6b76f5c239f9f317cea1a56536aaf227cd077cf0d3407a
font_01_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 10804 bytes
SHA-256: 242913841983b66092979e0ce3541fa7adc7ba25004f0c9eb61951816fde8cdc

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