Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb39dd7fab15e2f8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-24 05:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c3ed4f43fb5b503de66c1c55ca24531 SHA-1: d20d2023098f81c5304424718bdb9e924e921c47 SHA-256: cb39dd7fab15e2f823fe2015b31fe3a24a694e4850d0f870e750392c95d47ee7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting an attempt to redirect the user. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=kyte+tv+live+app PDF link annotation
    • http://atut-biuro.com/uploaded/file/bilenopelepakuluzuwapo.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/jaziw.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/21267327268.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/tudunodipipa.pdfIn PDF document text
    • http://wdnederland.nl/file/12858537915.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/nodimapavigawuzatan.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wikuwilurapikuxufufutexux.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/99242584452.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/verumasadagifexekiroke.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/tutitevolilemid.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/duluruwuteroso.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/kiwono.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/83184330014.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/wewirifupozojonunanilemi.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/53579407829.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/84173665647.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/40420998500.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1a816038a---16154677709.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/67782762126.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/busodur.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/23307940260.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/75733373446.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/59591259603.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/rafalufeki.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_off0000c36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 16576 bytes
SHA-256: a7bcb835c14701dae3f06d3c8a6278b9d199dcd79200da1c6cf6eef754bc140d
font_02_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 9924 bytes
SHA-256: 61c8a7b4495760605a1f7ed20cf84030288f3d9eaa7ad793d788328716e31804