Malicious PDF — malware analysis report

Static analysis result for SHA-256 57362ac4239cfdb1…

MALICIOUS

PDF

77.9 KB Created: 2021-02-24 13:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 99dff031246b6a4420495bffb7355f42 SHA-1: b020477ff1056b8f818e42fa2b62461644abf914 SHA-256: 57362ac4239cfdb1c9297ae99d981556253c3ebee06a66fc2ad6ee8168ae10fd
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a common search query, suggesting a phishing attempt. The presence of multiple links to disposable hosting and the ML classifier's high confidence further support this assessment.

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 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.
  • 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://yafferge.ru/strik?utm_term=how+to+turn+maintenance+light+off+on+2005+honda+accord In PDF document text
    • http://1freedom.space/panasonic_plasma_tv_power_light_blinking_3_timesipkv9.pdfIn PDF document text
    • https://zitasiga.weebly.com/uploads/1/3/6/0/136088478/bofuna.pdfIn PDF document text
    • http://daliadiago.com/blood_warrior_mame_romk2z14.pdfIn PDF document text
    • http://kudretbozaci.com/pefeguvidc9ip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470977/normal_5ffa32ee5951e.pdfIn PDF document text
    • http://keto-s1.com/manual_testing_interview_questions_and_answers_cognizant9hjzd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5ff7604f530d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boraxatisota.rf.gd/fipegal.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/hill_s_w_d_stew_feeding_guide.pdfIn PDF document text
    • http://devoleresi.rf.gd/farmacologia_benzodiazepnicos.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/natokizakadowib.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/xituvolovejido.pdfIn PDF document text
    • http://jusowegakero.epizy.com/vcf_format_header.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/aadhaar_enrollment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/4377627106.pdfIn PDF document text
    • http://dewubutojuza.rf.gd/38826710952.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_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 5708 bytes
SHA-256: 3dbc82abccd72e389cf65e1f987ef2c231ef796f2a5e6410858c7d45530222cf
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10816 bytes
SHA-256: 72ec1aad61c5cbad0ae41de4879690d2eeb4ddf19d3f8b3b58cc0235330efbbc

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