Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe5c559e2f5c279…

MALICIOUS

PDF

83.9 KB Created: 2021-10-17 23:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 111120d88d34e1dfd711a52d5b7fdd4a SHA-1: 8bde8c03e0453c45b0c96ec400fa992b070ed2b9 SHA-256: efe5c559e2f5c2790f230dd520f4cd51c2a140cbe33e893ea85c10d846d7e0ca
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, directing users to numerous external sites, many of which are hosted on disposable domains. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://liily.jp/upload/file/20211006144318.pdf In PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/96380261513.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/dejupedavapijedaned.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/raguvumuburafutifesu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161670c440a8a2---jerixabituzozof.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nafivagagusuwirurebigix.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/nejitavefulimeratoxipo.pdfIn PDF document text
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/kalexofalorizomunere.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/1114755537.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/kolebesudosi.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/64217006811.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/leratufitaputow.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/zufivotokovejul.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/43912706708.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/fofisutareposer.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/lonatemavajeginorabonoko.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pojudomixujuxerobana.pdfIn PDF document text
    • https://nistd.in/userfiles/file/lavujukexalufubotenidob.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/44433308201.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16163c5ada2101---37917885565.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/ribetomifalinoxilowelefi.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/26638928598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=cotton+fabric+productionPDF 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_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 17324 bytes
SHA-256: 0ebc5d3bd53d2a4deba2611078950aeb2ba30180331ea6c0795a2a760db32f3a
font_01_sfnt_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10536 bytes
SHA-256: 6983ec6e8fb541b7c21e557cc2d436568bac26a7dd5dc431d0ae9821bb440967

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