Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8bbe78dcd1853d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 00:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bd8fa99b3d9423618fff7a08b6ef6f39 SHA-1: 5728e8e1c854cec9b002aba43b5d5e9964d4034b SHA-256: 6a8bbe78dcd1853d3ab0a13ef0fb51495ded8f5bf5be07a98c355a78ac9c95d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs pointing to disposable domains and a link farm structure suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thebillionbottom.com/business_school/uploads/file/visuronirenaze.pdf In PDF document text
    • http://udokutscher.de/gfx/userfiles/files/podesadulajer.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/talalusuzukafusexunevonog.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a9767a069257a03e46f26ec9084e6b16/89446873597.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tukisurimanaj.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/7773937558.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/wavikexiteponixelomuvuw.pdfIn PDF document text
    • http://1careglobal.com/upload/files/ruduwowewe.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/16772846312.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/83478286281.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/sulatemomenokegowigonu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/zinipir.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/pewudo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130976a13cd3---94960297549.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/25414910715.pdfIn PDF document text
    • https://serka.com/serka/upload/files/52216043940.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gekigerananemon.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/niwifovavamif.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161314de66dd4c---zowosifijiguf.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/vobubisazifizesazam.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/jimawub.pdfIn PDF document text
    • http://co-mit.com/uploads/files/bexudubefemipube.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/77307158570.pdfIn PDF document text
    • http://fittbikese.hu/files/file/40673401623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=translate+site+pagePDF 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_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10268 bytes
SHA-256: 039eb8d1936a1b09730e8bb7c19235c7fef61c29aec1e24ebf69715c2b9ed4f9
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 18024 bytes
SHA-256: 8d0a39fd1f597586896945c4fa14fd97ea92589cf91bfdaea2258b30cc96f5c0

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