Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3d41edc43ec45a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 14:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa2eb5d453730eb7e47d6aaa8f607104 SHA-1: 32449bf1e9fedaeda484059f70ade4e3a7936d6b SHA-256: 8f3d41edc43ec45af687053967c069a2ff21efeb0c5f0bb83b6bedd50762311c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

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://contelex.it/userfiles/files/loxizi.pdf In PDF document text
    • http://sincaremedicaltour.com/js/upload/77273347914.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/fugajirupunuxiwutop.pdfIn PDF document text
    • http://princeverma.in/uploads/files/jawubugudipisatavokufewe.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/xamuxifowutexelis.pdfIn PDF document text
    • http://climtech.com/files/files/zozonuvotesizepuximem.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xizerularizefogitel.pdfIn PDF document text
    • http://generaldistco.com/images/file/16116967490.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/85455725664.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/mavefamorutegeronivagiju.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/41412168125.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/ligovopus.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/daresojorase.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/serumezuwuxudov.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/85655404087.pdfIn PDF document text
    • http://888chji.com/userfiles/files/filuga.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630545277.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/tagafejotofufusuv.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303b9868bc2---6785882564.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/98731511253.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb3ea9730---monepelawovute.pdfIn PDF document text
    • http://autodilygood.cz/files/file/21220100226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+minecraft+mod+apkPDF 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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 10636 bytes
SHA-256: 6962cedf210febfb62718c715c1a6c549770737e3cd4e70ed93c910c3fc49be7
font_01_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 19300 bytes
SHA-256: e4d74a9e5feb04dbfa25c2a66603feed2e17c3b4382c81217fbc077a9c08a80c
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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