Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15635ac9e226aaf…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 04:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62c3418ca7b128a08f83e77294af6cf8 SHA-1: 5a7a9eb395b8b6f145dfcc3b0a42001999a614b6 SHA-256: d15635ac9e226aafef48dabbf78d5893734a8adc7a11c4331ebf7016c45c72c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many of which are on disposable hosting, and presents a visual download button lure. The presence of embedded URLs and the overall structure suggest it's designed to trick users into downloading a secondary payload, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://synerhu.ru/uplcv?utm_term=minion+rush+mod+apk+2019 PDF link annotation
    • http://sanzmendia.com/userfiles/files/47269979668.pdfIn PDF document text
    • http://specimport.by/files/files/11820628388.pdfIn PDF document text
    • http://aa-nusd.jp/jeluwafapesowigedawuf.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210901155240_MjU4OTMyNTM3NDk=.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/wetarimorolekaba.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/97686094109.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/xakebol.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/xavalepavevumarolomizib.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/98909780994.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/68618661891.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346d01733d---10268830532.pdfIn PDF document text
    • https://designclarf.it/file/36332704754.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/95808838105.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/16359124509.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/foziwuwapuzitasota.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/65975221823.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/88897295495.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/koxobe.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/68154182500.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/gujuxevepof.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jitulapanaxitipeli.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/42734520064.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/82341432523.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/21856762487.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/tonuzinixeji.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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 11028 bytes
SHA-256: efa67be30edccdc15ad8a2fb6b5004cd38ae9efff43381fcf60e1dbab285ab7c
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 17932 bytes
SHA-256: 978c6e9781f9a3c99e73ffa716e0c95b1297673fe8c5fde51752107beda529e8
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1