Malicious PDF — malware analysis report

Static analysis result for SHA-256 477d5d823b7a02fe…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 20:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5464dd4fc1443ad74dd6abc6db3b9e1d SHA-1: fed1e0ebe76ed005c43400bc8844db8158ba66bd SHA-256: 477d5d823b7a02fe8c21ea01a0ac9669db3a8ed138098212d77f25fd53ae8e8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://lightningriskassessment.com/ci/userfiles/files/pewerovuzegijesobelesoxeb.pdf In PDF document text
    • http://opgzvh.hr/upload/file/madosipemiregev.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/vefefenuxalo.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/madujegujigop.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/77696906030.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/73939664691.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/6340882996.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/wokuzuzulalubomafimasove.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/besase.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/62790537056.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/pixevobefivajifuwe.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b704989e5f1717cf08b7b8c7f1e05e3/51567464056.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/19373335411.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/59265583117.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210917_020946.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/delikalurekekifiguzoxijo.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210922234723_1366102844.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/bapobefupelefonusogob.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/pijozedegedamidu.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/woziwokatodolajenalip.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/52930023833.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/10677067098.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d0acf180872b9e0a81fd595089ad41c0/6551100198.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/76338520780.pdfIn PDF document text
    • http://yibetter.com/data/files/xabelirowos.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/romevivibimesunudot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+v+android+%26+iosPDF 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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 17064 bytes
SHA-256: 439ecd28bcffa32564321af6fd63d099d4ae659d55b0169adf79fc3c9e164255
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 10000 bytes
SHA-256: 0589ce12f4f3a0fefcd076abd72b5edc43677b3d3b24c95f07911c5063c4218e