Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf62d6c563fd18b5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 06:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 731617d06b67dee156c56f92ed26a03e SHA-1: 589af5a0b2e47430f237370c2c2ebcac3620f51b SHA-256: bf62d6c563fd18b513b9ac263899d2dddc94b4d1ab27b89321e34175c0a2aabf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://findacommodity.com/upload/file/velofivokiwig.pdf In PDF document text
    • https://dennismaloney.ca/upload/editor/file/gavalitelaxovabirigirir.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210917101122_4oetk3.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/98925151389.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/67538638097.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xubajakijesigetuni.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/tosoxonavujat.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/gotufewodurujetisoxama.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/suzexemiv.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/mapatimifogukesekabiwexa.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/daruzafepapew.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/636249176.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdfb7703aa---31377336941.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/92156095938.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/70626053094.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910065740.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/55086962197.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/72fe8e3eef3eedcc7fcce532881aa97b/48773090094.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/gupodenemet.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kenosuwaresexejowakanevew.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_061403.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/52282826798.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/faraxuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tes+mmpi+2+pdfPDF 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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10112 bytes
SHA-256: 4a7c91c5db3cf4d540a8c7a61765991196d0b750cb0ce602f8e91ad4188cbc98
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 17196 bytes
SHA-256: d95ad91bda2ceacaf0339b4786dcadb5f56567e85c83f1181bb387041a80e7b6
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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