Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1a1d540a338822…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 07:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea6689eb88026f1b10f4f05bfa32bee2 SHA-1: bed08165aefd18ba155ef74b9afbf152a57f9e21 SHA-256: 3e1a1d540a3388227fd49b4637029605ba52e8b1f7a5bf9ad865db9ed624f362
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, indicating an attempt to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination through a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://i-intelli.com/ckfinder/userfiles/files/dulexat.pdf In PDF document text
    • https://nnkcreations.com/userfiles/file/lixonirisinusejoto.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/32480979782.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210912101757.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/zowamavibesijiwiduk.pdfIn PDF document text
    • http://domainecomps.com/documents/files/74447138577.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/bodataro.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef914f10d9---92282683400.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/fubapuxabotusanujuw.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/pigexurugoxol.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fubevozefuxabexovi.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/38355886213.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202195112216079.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/fudumisakem.pdfIn PDF document text
    • https://kawanmto.com/contents/files/24896867573.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/63621854728.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/resademoxuwikodukatoti.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/wuwevagivefamuwixiwube.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/16723983342.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/84590966169.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/35010093477.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/bizuf.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/pezavofavinulirapuresef.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/vated.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tonagonufevumaduj.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqcpgt8t1hbh2q6s5ughn2d0gq/56049920316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sonic+smash+flash+2PDF 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_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 17132 bytes
SHA-256: 7f16da1ceca0ac5a1c4b230510a1f71fd59a236fa82ef146f9834a82df273d0f
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 10468 bytes
SHA-256: 2d869d719b5f20f419f15ce7a3d4afa71fabab7b26a0bfa27d767769566a1a28