Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a517c686b35e2d0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 05:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abd792c985a95ddae38b8083db9a9ddc SHA-1: 7ff8028d5b2f62b9bb664a153e1fc94f1ec258f2 SHA-256: 2a517c686b35e2d035ed2470172b81237d2b230c1811d1fca02d16dc7a8d5b60
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://huntic.ru/uplcv?utm_term=how+to+sync+a+smartwatch+to+android+phone PDF link annotation
    • https://cepatdaftargroup2.com/contents/files/94446275686.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/vonopuvo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/60077117951.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/79161982346.pdfIn PDF document text
    • http://ingore.cn/upload/files/92122266429.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/37628936820.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/50586239495.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136856326d78---jefejikigu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367888e0c4f---75632789654.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/nokemuwil.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/dixosonakurag.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/35575987553.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/65787404630.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/33767829182.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/90685834093.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/98327020751.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/vozata.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/fuzovajebalis.pdfIn PDF document text
    • http://rinsacars.com/files/others/12775102444.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gisasinujifoduzobubejat.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/41698206122.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/suriz.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/diroxiwogi.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_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 16936 bytes
SHA-256: 5976de4a288ab373e8d254794fb6e33dd3526abe53c27908fda684564f2ec23c
font_01_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10924 bytes
SHA-256: 4f23ae964cfbc9685387c64e4d2f1aa3cce5c7a74e61520aad73a37382acaa6a
font_02_sfnt_off00012985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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