Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3f2c1e38e91443…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 19:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecc2b1274d8ede05240bdbc732113985 SHA-1: 24b854aa0f40d43fc90e79f42457bfdf7489b428 SHA-256: 5b3f2c1e38e91443238589f497a918609f5f3bfbf73f6e91cba7c9dea7f79d25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of multiple unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://stepweystudy.com/ckfinder/userfiles/files/1156260114.pdf In PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/53895115378.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/60358616778.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/doxasokejakodiraduwusulu.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gimazozeb.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/86436235662.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/taxewivififadorakasubo.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68308148167.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630835018dovevenofu.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/wevabuz.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/nelirewenawikupamakarutaf.pdfIn PDF document text
    • http://babamoleskine.com/files/file/tixukopedekekebepa.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/kadefakowezipimefi.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/rakaduweginiva.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/47087020206.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/55f3dd4283e7d8905e54deba8ba8ac0c/kijovazivulokorewo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nituparulikulem.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615085ccdb4e9---nutekesogo.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/mobonoxitigakalunopetivuw.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/majapugefipas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=world+best+hacker+appPDF 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_off0000adbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBF 17068 bytes
SHA-256: 35d80757fbfa7c374a9d9dba35cd083a561c4cf72028893324d02b01a6254b44
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10640 bytes
SHA-256: 236fdc1e7f25b8225c80e8bd90c17b90c65445eef47bc2e6fb643b670a51c486
font_02_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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