Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ce90801cb20650…

MALICIOUS

PDF

102.0 KB Created: 2021-09-21 06:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6f39a0c6972d6a0890fb5e08bb325dcc SHA-1: 4d286757e254476bf8831aa5384b7ac7027d5053 SHA-256: f0ce90801cb206506169e7574280c997fcdc9507893b8ec9cecbd2e70ee15582
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 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.
  • 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://eklyps.net/images/file/logavosexamis.pdf In PDF document text
    • http://animationcoach.com/userfiles/file/55567174999.pdfIn PDF document text
    • http://neuroxl.com/images/file/75942795572.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/57807216928.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/11768247927.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/24063759046.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/vodofogameledivewubov.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/niludiwazimudireb.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/29442417445.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/kirizikibesemefe.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/sevoserapurasawawepip.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/23348509485.pdfIn PDF document text
    • http://gardatrans.com/content/Files/13835387882.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/26587300955.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/vorupaxigowuku.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/25083446194.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/37965324106.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/bonavotoluduferufif.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109151505249551.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/96628373085.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/pujumuvukigot.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/salogesiwunurivefateje.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b03da40c---22481162145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+react+frameworkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6A 20020 bytes
SHA-256: 565817435893bd1519e1225c1a448940e7b34250a1496f1cff6dd33235383cfb
font_02_sfnt_off0001726e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1726E 10488 bytes
SHA-256: c78943ce26bcb8e1ae7b55d77448457cdcb0360e44945fc6a74fc52d2dd55fc9

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