Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01cdb358e625085…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 13:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b4ad83ce6eb6ea488f03fb35622e0b9 SHA-1: 8fe32a84d602e08773190572eaf0aff0cf0508f6 SHA-256: b01cdb358e6250853d8cd24326da918652274c1e8186cf7026fc932bb418a8ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, often used for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.specemc.ru/upload/files/detojexofom.pdf In PDF document text
    • http://cartopack.be/Images/file/44250364485.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/80116904227.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/vaniteravegunuladuk.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/zumuwolotipitesomaka.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/norojulakatotetulofobapuv.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/wawejidagadar.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/27078981811.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/18698833068.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/dizubalumew.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/folepufatapegalefipu.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/35296386750.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fafatawade.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/papurosudutafadubavomek.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/41723859422.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210903101244.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/59149429501.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/84969825844.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/88246165000.pdfIn PDF document text
    • http://partnercable.com/files/56544649981.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tuvetededazaxigakedal.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/25940205257.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/vegipudomike.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/watenisonal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+sdk+command+line+toolsPDF 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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 10604 bytes
SHA-256: f4219f270ad6e57d5cf24ce2ef0423380c18a9e430a0f68d1a459970ebb2f0c9
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 17512 bytes
SHA-256: bb1a49abc775fbb033825d19c6c49fa8765a36901d399d4027afe7059697be26
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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