Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af45ae0107bb58…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 12:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24eac9c90bc1d33f10098184bc187b62 SHA-1: baafe00868721f38d221c6ae0b1ca7b2d6295a11 SHA-256: 85af45ae0107bb5840309449502963e487ea907abf859c8788ac5585840478e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document likely contains numerous links pointing to various domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hrt-foto.hu/_user/file/delodarazetir.pdf In PDF document text
    • http://iwayman.com/uploadfiles/file/210914021724742781tuja1k.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c00ed1042---96993159108.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/49302027925.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/menisa.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/zexusidoguzuje.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/wexoninalinilume.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/18169682397.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/46157816883.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137afe8c4513---furadizudilidotebil.pdfIn PDF document text
    • http://www.77ice.com/upload/files/pikakexofaxa.pdfIn PDF document text
    • http://reopen911.info/media/file/nudofiwodixirupibu.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/29523837152.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/razademuvex.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/13559593438.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/fotujelesikixujafoduze.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210914_28645F083E0C601F.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/bavedifulasujifetu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/99406280243.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/xilijegawinevomovab.pdfIn PDF document text
    • http://poorclarescork.ie/images/97157913122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=insaver+app+downloadPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8990582528.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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 18052 bytes
SHA-256: 8e0db89d3598dcd2d8043e34e4755da77d56947f76afa5c43b7cef9e6a83769e
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12308 10300 bytes
SHA-256: 46b446b2fe98cdb315514d64f7d2041d9d7446def244cc50a42c30125b9e51a4

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