Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26762965036aebb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 12:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ff10d19e27b9294a1e0917c40cb05ab SHA-1: c532d0c1c6e7eb555d01bd74f01e5300689e9cb5 SHA-256: f26762965036aebbfbcf688c8953ec245cf25d01d56f8fc362d811019e8c2f29
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML classifier score. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests an attempt to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://karlholmbygg.se/UserFiles/files/36731617076.pdf In PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/88376781792.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/weziradolifenivivosavi.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rufajapakabemo.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/voterufowuvitijelakebamix.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/61916348319.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/79905100358.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/40951951005.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/vawazu.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/wutap.pdfIn PDF document text
    • https://anakmeong.com/contents/files/35042105247.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/dawakikewosaxexal.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tewivolerofidoxigene.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109090838403071.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/42839326800.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/rixivujodu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140135f3204c---7741316846.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/jivovufilibib.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/3280778765.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/kekufoso.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb80d04766---69774478586.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16111774055.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bewezigupiditamuxixukewez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dark+souls+3+save+editor+xbox+onePDF 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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 10912 bytes
SHA-256: efbbe61279c28617d9640c65cbdfc7b13b2f32a98a1a3efb8395df76b61af2dd
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 18696 bytes
SHA-256: bbd1f5ab51e502df39649aab5cfafba974e49c326d52af2b9dcd803019c7e2c5
font_02_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1