Malicious PDF — malware analysis report

Static analysis result for SHA-256 18003cb4302583d9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 01:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 444553b2e8820b3937d15095a7cabd0d SHA-1: 5dc5132d395baa0a52ba48470972599378a024f5 SHA-256: 18003cb4302583d9c70a824a08ddda55d55c672668f7a14aeb21991f38ecacd0
142 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 are hosted on disposable domains, indicating a link farm for distributing malicious content. The presence of a visual download button further supports a lure-based attack. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mlsy.cz/images/file/files/dodugu.pdf In PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/74940980355.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906034644124.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/rigemovofowotifonulebitun.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/tojekonav.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/64651605342.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mamajelopugafupetugagu.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/85241873448.pdfIn PDF document text
    • http://partnercable.hu/files/50803818575.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/21335885636.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/62781175724.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/5122693274.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xinodarisigubife.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/40b23128ff957358c6b974b05690e7b6/43340717367.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/luzosasivewefuko.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/wexixadepanesaw.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/15050731939.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/xodiw.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/vezalefekugozu.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/62653482735.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0c1287fe---74349551725.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/89780092230.pdfIn PDF document text
    • https://tierlistei.ch/downloads/mevamoliwokezuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=iremove+tools+full+crackPDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 10512 bytes
SHA-256: 3351d04fdd690d8b3a0517ad107f227571cf12d1bfe79868a8257be95de3b665
font_02_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 17732 bytes
SHA-256: f658caa3a8670e846450034671add9ef26afe77b7e8dcdfa4286fb88daf75c45