Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1b774b250cb2a6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 12:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e4588a77b22b523656fa35db9e52cb9 SHA-1: 44f1670dad4faec361c00cee72d20f0471e80c19 SHA-256: 3b1b774b250cb2a6279b41ed0435d5e64dface3f670c22061780021b974b6d10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=x+plane+simulator+android PDF link annotation
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/giwore.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/wexuxurifusolijevali.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/4321087307.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/70046234753.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wodamuxamajo.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/67411110329.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/rudovenuzapomate.pdfIn PDF document text
    • https://comfort8889.com/upload/files/dokasawakukaw.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/kuxilalixozuxumikufidebod.pdfIn PDF document text
    • http://malifer.hu/upload/file/bevubibojemizuwulite.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/59738921505.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdfdbf0ac---penivuwijugazu.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/lesuxiritajozevowux.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613048bdbe7ac---96317562230.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/36633676339.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31767780984.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/24973253208.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/50430299503.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210912000302.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_C02E483F35368346.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_02653F17D97A7895.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rofasesufufegu.pdfIn PDF document text
    • http://195exim.com/datas/files/lunuku.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/43141486889.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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 10660 bytes
SHA-256: b1f6f4bb814dbe857aa2a02aadd734fa240a57ad7cfe73224e10819fada09605
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 18772 bytes
SHA-256: 9453318bc935acdb9410131be91f32190e878d7906514d554045651ecba29ea7