Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f47bfc7d38b91dc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 21:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 403b8a3d0e4884083d1d7da803222457 SHA-1: 76abf79ca5504f36c58ec55e42b119d8b5cc30c9 SHA-256: 2f47bfc7d38b91dcbd175733f806d24454d322cee23c10ed60d2d53f929c6455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. Multiple embedded URLs point to PDFs hosted on various domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://juhaszautovill.hu/userfiles/file/42913617083.pdf In PDF document text
    • http://ya-ke.cn/admin/upload/78079923020.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060713228981.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/biked.pdfIn PDF document text
    • http://teifsepahan.com/files/file/tulaj.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/fesojatukobisufepadutagas.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/tunatidirapekef.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/20982504589.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/91644877790.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/11121500170.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/gilezul.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/50558347769.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/merovoputikopalefareba.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/48937486519.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/68648182786.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/45078595821.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109070136122609.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/44246434083.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210908043503.pdfIn PDF document text
    • https://efnnma.org/files/file/pituzomuwujo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f271aae84---4143218538.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/taramufudes.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/37607387232.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/rebavexawimuzonawutos.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/13366436704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+save+contacts+to+phonePDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 10608 bytes
SHA-256: 90586a8980286719c5d598515d358c3906aaf5eec226d43cfc66d84dfc5983d7
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 19192 bytes
SHA-256: 0b1805339378338390f8d1222150f91ef341df0e818cd1a612566e12a0c2d56a