Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9e21a63b75e522…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 07:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1995aa26472cee8dc46d95079f3a15f1 SHA-1: 9c10e69745912ba4a2202bf91595c3e5557cd257 SHA-256: 3d9e21a63b75e522e65026f3bfcf269b09a026c1d9318648339ccd6bba5e2971
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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://drafthe.ru/uplcv?utm_term=texas+flag+wallpaper+for+android PDF link annotation
    • https://webmanagement.colortown.ro/images/file/37435081668.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/xebixariwo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd208c6f75---kumiminawupowazukaposu.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/63568545067.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/guxivuzefuserinaw.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/rofam.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/2140016465.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/zuvedubirujidigugatas.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/34836834177.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12099270859.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/48137302589.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/nirilelimixo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/38639898981.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/jixixukinabosev.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/24502211305.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/suwosamab.pdfIn PDF document text
    • https://rjpexport.com/files/ravawodekupug.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/tabusikefosu.pdfIn PDF document text
    • https://langumeistras.lt/i/File/21621139409.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/33530345058.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/46572431444.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/ziliv.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/19025424150.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://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_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 18068 bytes
SHA-256: 4f3365c322f2b89cae075d3b519333236cb361c05465276cabb698003ec21443
font_01_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 10724 bytes
SHA-256: 3299facefaf1ea5b476040cbc968b3adac80fbad9c1de015630837bd3988ef30

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