Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b0dfacaf8f8c52…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 11:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0dee4dee4f61347d5e75b9f1e3439155 SHA-1: 68cb83e8a7f81772fd0cec8d96ecd59c7a6f4a0d SHA-256: e8b0dfacaf8f8c524c91fb5e51667e5d3399f5381dfedbccfaa73e85960a1abe
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, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=collage+maker+for+desktop+free+download PDF link annotation
    • https://hometeamcorp.com/images/usr/67169448756.pdfIn PDF document text
    • https://birudongker.com/contents/files/kewijaxajox.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/46462231905.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/pelipenomufero.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/nonumadapiposa.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210909_7B35885298A47701.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93196285654.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/34240028931.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/sanosudiv.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/49758540952.pdfIn PDF document text
    • http://sartor.ru/upload/files/75196343179.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630528532.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148b5e70f3ff---48304319219.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/21598452953.pdfIn PDF document text
    • https://spyboarcams.com/files/57083896623.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/ragovasekajoxe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53d441a41---bewomudukunis.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/pepuwufugiragorepen.pdfIn PDF document text
    • http://punaide.com/userfiles/files/70286439106.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/sijib.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/726957475.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_off0000ba53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA53 17396 bytes
SHA-256: 3bcc686ff2af344a9685863bbdbeacb4b616052439618ff278b32dfe6b651a20
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 10960 bytes
SHA-256: affe3f9306665fc78ed5d5d59786a78dd4c8bcfc4a34bff770e10cc2df712926

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