Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58d46d1437e5163…

MALICIOUS

PDF

76.4 KB Created: 2021-02-01 16:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7be0efac7cda23e6b87b8c348fef6471 SHA-1: ebc722b56b458222d94b4e0f136e0225b14d1d61 SHA-256: e58d46d1437e516344068328c5154dd758dea95735ba31b96c3a0026e53993ea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The document body, though heavily obfuscated, suggests a lure related to educational content ('Acids and bases ppt for class 7'). The presence of multiple external URLs and a high ML classifier score indicate a malicious intent, likely to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=acids+and+bases+ppt+for+class+7 PDF link annotation
    • http://qlemelest.online/pc_games_download_free_windows_7_city_racinga9wwh.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/c9hejfH/last_football_coach_to_wear_a_suit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463533/normal_5ff23386cd1b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_5ff8ef39400d8.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/2952080.pdfIn PDF document text
    • http://begdas.space/2008_hummer_h2_repair_manualanc8o.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/dhigdjc/midejepizifusititanit.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/koduliwajudedgbohg.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/fgfTjbI/wisuzasivopewoxuwada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472763/normal_5fe253f7cc3c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380228/normal_5fccba0525295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5fc7e993db930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fe3348874bec.pdfIn PDF document text
    • http://nesobaka3.xyz/polaris_sportsman_500_service_manualvg289.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/azibhjk/dog_simulator_games_free_offline_2020_sheep_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/gMXUqKE/65267320581.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/4755580.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/2365be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489992/normal_5fee4736941fe.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/tarizirefevifab/83900784121.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/technical_report_writing_examples.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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5360 bytes
SHA-256: c59305c23a3ff96273c7d5af652c332ecb4e2284efeea0d9dd5cace4e4565665
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10168 bytes
SHA-256: a02ca77b7db9b383ef417c2810386094a88c53b38f8ee2d257134982f607900b

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