Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5637059e3fe728…

MALICIOUS

PDF

73.0 KB Created: 2021-09-03 18:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0f3015aa79cc6aaed4a6ee8ccf0ba1c SHA-1: 1068b0dbbe1c64b2381debbad10bf8b95fddda62 SHA-256: 6e5637059e3fe7283ff9f3ffdba6690369f1b185bf43e2ec6e7f454d6b587398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. While no executable scripts were extracted, the PDF structure and embedded URLs suggest an intent to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://laweasy.kr/userfiles/file/dojobofu.pdf In PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/wezufimasizuwub.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/figasivujewum.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/82874023516.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/lexinilomapij.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/vopokenonerasono.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/61747129650.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/kemopalefa.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/jokaxebakeloseriro.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/82660423388.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34afa08674---bepur.pdfIn PDF document text
    • http://bakoca.hu/files/file/zukiwoxit.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/wokofoxozivegutalaseji.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/588292108.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/57883176099.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/ketebabusawezez.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/mavagojomovanilulinovige.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/joselupimow.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/dajinutajaxup.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/gapuwaxazaje.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/55847835551.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/mozop.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/5398147918.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ef0b2723a130b751d677f6cd6836074a/posanetatojaj.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/panepejirirope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ortografia+y+redaccion+para+secretarias+2017+pdf+gratisPDF 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_off0000baed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAED 15948 bytes
SHA-256: de9ed433d15ce0042b035ded7181c27d00e05a95cabce7a66349a7bde6bc4386
font_01_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 11232 bytes
SHA-256: 00c1608e68d8aa31a66ad42c2ce36da3896e5b4ffe5459faf83e63eb969ef1a5
font_02_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1