Malicious PDF — malware analysis report

Static analysis result for SHA-256 1639c53bacf60fa5…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 15:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c22436c6d7e007d53312003ea27de1d SHA-1: 0fdf7df0000b4f41358eea7682d4a2f33d703e83 SHA-256: 1639c53bacf60fa5f0b93a1b00de583bfe3619fe654dcf35232962ede0ec0e9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the overall structure suggest this file is designed to facilitate phishing attacks or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=ziggo+tv+app+android PDF link annotation
    • https://drishtinetcom.in/FCKeditor/file/79718962643.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/58172032554.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/xewukafafudaxewaworofut.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46057210476.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/55198751140.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df98fba375---bebitaxuz.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/37152250945.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/59761469321.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/052d30f57ad331b7a6bdbe34906de74e/kuxazigelemamovozoxi.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/nidapuxowi.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/modat.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/46553107333.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/kisedini.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/nomasixodelegogofatiz.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xobuxitizebev.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/15140988746142de46b6846.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/xovemorimolaboluru.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/8896996854.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/99717012862.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/46360358218.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/vegivubizejimam.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/wafusu.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/29738777323.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/vukipo.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109101321421865.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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 18196 bytes
SHA-256: be3fb4e332b3526d587ae63232995df5138dc4201e4d4b2c02b1988d8dc17845
font_01_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10248 bytes
SHA-256: d5efe5a80545c068ae1a1a0d53277a713ca93731b94d911a2b00f209097b6213
font_02_sfnt_off000137b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1