Malicious PDF — malware analysis report

Static analysis result for SHA-256 1387b043ee92aad2…

MALICIOUS

PDF

90.1 KB Created: 2021-03-21 01:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 757a5b283ca23bc0d6d80768ad1a4592 SHA-1: ee16cd1372ccdc7d37cb0a5f58709ffb3b7186d1 SHA-256: 1387b043ee92aad2e14aa3eaa84a4b3122f2337788fe801d4405846935ad0d6d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. The primary URL, https://vilenefex.ru/award?keyword=cardiology+sheet+pdf, suggests a lure related to cardiology information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://vilenefex.ru/award?keyword=cardiology+sheet+pdf PDF link annotation
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/b2fa6da4827de.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/ecb5229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fef94dca5dc5.pdfIn PDF document text
    • http://ridegibulas.22web.org/pdf_to_editable_word_converter_online_free_download_without_email.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/nefajof_nuzufajiwiwu.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/7183592.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/nakewesilu.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/vajod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470401/normal_601bdd5adb4a6.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/ranuderede.pdfIn PDF document text
    • http://xadixul.66ghz.com/bharat_movie_audio_songs_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_6027732907030.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/ditaxefugagofeliwer.pdfIn PDF document text
    • http://vemiwegar.iblogger.org/how_to_look_up_google_voice_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigerubuseke.rf.gd/55147364834.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/62173023739.pdfIn PDF document text
    • http://tededuliwe.rf.gd/celestine_prophecy_tenth_insight.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/ultimate_miniature_painting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/serato_dj_software_free_download.pdfIn PDF document text
    • http://zaximibirada.epizy.com/electric_current_class_10_ssc.pdfIn PDF document text
    • http://maviwapas.epizy.com/97184191990.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/mepujigefabuniruromewuza.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_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 5308 bytes
SHA-256: 00a5889723eeaf20e6a7aa8bbd7a2f7dc64947b1f5ee92f45ad10a903e7a05eb
font_01_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 11132 bytes
SHA-256: 151684d6fa895175fdb667f6ac2c1da9f70d1ee8eea66bc8d2fd46524a4a1d06

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