Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36913b732254ba6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 22:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98a59f83c1c96a8823d917dfac0ef6e0 SHA-1: e98ac8601e3937a5060f3295b5cf5cfebd53124d SHA-256: a36913b732254ba6c6f8660fc3b7937280be6ad909e63c4374071c1f56413bb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=adult+game+3d+android PDF link annotation
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/4380089169.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/wabunixifudo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jokimanuluzikifinokif.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/79143125247.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090222155582.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/9850318790.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/40243242300.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/bubapemizunidosoxezorov.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/lidokezelew.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9dbc6f0d---19224281950.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vowuguloxigo.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/16918137253.pdfIn PDF document text
    • http://surausa.com/uploads/files/2272963469.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/sizexarogoxaxitotagapewav.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/wotine.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210902_72E918C484AB96B5.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/90031022620.pdfIn PDF document text
    • http://robedecreateur.com/img/files/darizolupuboxopivuj.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/bipinipozonalisikufixaj.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/56645003150.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6dd2f3c7---teguligezexujotox.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/kovod.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46044337709.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/49825849922.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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10676 bytes
SHA-256: c876ff69d0e9b604b8fa9b68bdcf0d7829af126d8b4bfedc5494396fb0875c23
font_02_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 16992 bytes
SHA-256: 72bc6b1f69c3771fd979f1def73f854787c1a2706a507c9432d7c902eb5424fd