Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fe1be4983a1543…

MALICIOUS

PDF

67.0 KB Created: 2021-01-31 18:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 71f880c482362d8a20719b6b1f4dc9da SHA-1: 93c12e00335110215b282a8f4f85c75a40713a63 SHA-256: 72fe1be4983a154330da40bdfb31034271a1079dc2e0a31696552f2701796c0d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, with one notable URL being https://jacksth.ru/123?utm_term=h%2526r+block+deluxe+%252B+state+2020. The presence of PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=h%2526r+block+deluxe+%252B+state+2020 PDF link annotation
    • http://gemajesubon.22web.org/olympus_endoscopy_service_manual.pdfIn PDF document text
    • http://natlab.ru/zombie_outbreak_game_answerss8tu7.pdfIn PDF document text
    • http://tinutig.22web.org/wolisaxubavamigekid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fffb42aabf2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fceba0494ddf.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/7670257.pdfIn PDF document text
    • http://vodabezoli.iblogger.org/zewoboxenifoxupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5ff13393bb5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_601325d8cc14d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386087/normal_60020887f2700.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixujoteb.epizy.com/beowulf_critical_thinking_questions_and_answers.pdfIn PDF document text
    • http://jugorufu.epizy.com/ajay_yadav_anesthesia_free.pdfIn PDF document text
    • http://banugigo.epizy.com/mechanical_ventilation_pittsburgh_critical_care_medicine.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_off0000cd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD83 4116 bytes
SHA-256: c92a4cbda69e4933eb29931463064b77751a13428f133e494d4df8174731d2f8
font_01_sfnt_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 10752 bytes
SHA-256: 5df978186296b8eb371ba80061e2f519a3e9671c83d2c97f99ca79846150c8d2

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