Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a931c9c06567cc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 14:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53847a01eaf6128aaa68d53f7470763d SHA-1: 8c93c7028427b2f2f6697ef297f381f516f72035 SHA-256: 75a931c9c06567cc68fa76f6aa7b6733cf497f02d32901bf63a3ec606450ea1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to potentially malicious domains, suggesting it functions as a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=walking+dead+comic+torrent PDF link annotation
    • http://burmeseburmilla-allevamento.com/userfiles/files/sojafega.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/16223532890.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/tobajitetujexu.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/99899079783.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/57178489568.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210912072922.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109120716224899.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/99305578780.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/fasovojukot.pdfIn PDF document text
    • http://17njl.com/userfiles/files/64069891592.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/51982414660.pdfIn PDF document text
    • http://onlinevay.com/upload/files/poralinumulivekugog.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/35901418900.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o9bcdennu77cuuc0h9qq3le6s7/dijolarutud.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/duxulu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb845d821---28156573083.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/derekipotowemoribepevu.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/12064131912.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/63456816871.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/44129586973.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/84965219064.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/26834967447.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/xuvigopiwibavufulivisedel.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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 17128 bytes
SHA-256: 49d05bf1c3f0234dfb3a7beba243fe80ed6322ca5d3ace5ae81d63020115dc0b
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 10632 bytes
SHA-256: c1373fd8ecf11a6641a4673b6e9835ba0d3c788d51923c4020393b70b528f5e2

Open this report in the interactive analyzer, or submit your own file for analysis.