Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a73cc26c3e9eaff…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 07:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0108af4bea09d1f972e3ad839ab1553 SHA-1: 3041df8da0ee233a148fe0f23fd5576b2961bdfe SHA-256: 0a73cc26c3e9eaffced9e3f5e40296a89f559280df6f2b9c991756f71419ad8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of many distinct, disposable-looking URLs suggests a link farm designed to redirect users to potentially malicious sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nwdglobal.com/ckfinder/userfiles/files/wimifanirun.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wadiwogogeteworebotuwobof.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/19696722369.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/rorujolat.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/33337144512.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/pezadiloronaxotilugotido.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/kuviga.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/56343283582.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/fovufexiwokud.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/pewuwoju.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/94347234024.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/kejixisonisiwezurirubebo.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/tufuxumos.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/77010957503.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaae8e3a57---63939304212.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210911_553FBF96432117F5.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/kakonom.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/56513127563.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/60271521563.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14508951775.pdfIn PDF document text
    • http://artio.pl/files/files/zaniteto.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/25536779472.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xufavew.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/23344683135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aimbot+for+free+fire+hackPDF 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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 17240 bytes
SHA-256: 9d2d4395e2b3c71dc292d123b19f9532a81d8ab5da43248883efbe171a00a349
font_02_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 10496 bytes
SHA-256: 9fc0c07a503ac961bbdab3d02aafdcf6c92f08477c920f7b3778799384c2c0eb

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