Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7b9ab1d33e888d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 21:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53de170fd92d564680317c61e9861aca SHA-1: 788a0905c08a486ce4cdb9b8ebdd84d613a5b069 SHA-256: 1b7b9ab1d33e888d51dc063acd9da45b0f0b7439be4958d6d4c5b89da9ccb8b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous other PDF files hosted on disposable domains. This pattern is often used to distribute malware or conduct phishing campaigns.

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://padservhosting.com/userfiles/file/lirizujit.pdf In PDF document text
    • https://curvy.tw/upload/files/9079979407.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/vedakanepe.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/kexuvokaxomazoxek.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/muvewitusubekudevazag.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/51290827363.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c664f7a63f---71705483875.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/liguralaso.pdfIn PDF document text
    • https://kokomanis.com/contents/files/24649173109.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/71086344368.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/dugirejevukevajuzazu.pdfIn PDF document text
    • https://pixel.bg/img/file/57960528356.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/gezoxumev.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/wumedupox.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/tuvigifa.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/84668833046.pdfIn PDF document text
    • https://renault-service.com/userfiles/sixaboserax.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/50872991739.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/fopujosusurosozakalajatab.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/82664206319.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/gurasizevajuxofijafid.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/22228351924.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/kadusewetoziz.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/vudubawiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+dolby+app+for+androidPDF 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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 10796 bytes
SHA-256: 7e1ce8e7ab85e9ac2351f6b07b8503ed92ba8df49ba3ffee07438f5c52629dc3
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 18056 bytes
SHA-256: f0f9076452adc12336b542ed245075955f00a4a41e2d080452884ac82279fc56

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