Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c61f1e8d70808d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 09:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b450d4b5624396ea189f4af32d6fc1c SHA-1: fec485ec0f39a6cddb41f633938dd7706bb44b13 SHA-256: 03c61f1e8d70808d3634754090ee0a13de00ecc05e523f3ffcaeed600242ea7c
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to redirect users, likely to phishing sites or further malware. The embedded URLs, though many are unknown, contribute to this pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://av72-reklama.ru/userfiles/file/1631131503597c7f2a7bfba9e7dd.pdf In PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/dajuvegarik.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xoxavisuf.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/25435694995.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/36040128006.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sodisodefabejonepe.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/zejitarutikenoxapo.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/50274421780.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/pabudokobud.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/ziralijovezi.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/34616179191.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109121251286344.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/loxiloxer.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/pobobafufowubulotofa.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/7843030177.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/5728069130.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/be42a2e8f2569dd838e129b827072b09/ragofudevagifolemapem.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/82891591698.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xoxagez.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/pamotesujobit.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/15558258115.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0f78ad70---3909277573.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/90405307927.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/voduzojeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=official+liker+instagram+followersPDF 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_off0000c5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 10884 bytes
SHA-256: 70e7fb2cdd6ab39d236d685bba247ccad769863f8f67ec7a56438ff08ca8bacc
font_01_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 17292 bytes
SHA-256: 0f185a7e19a8c491bdd02609a16452f3f8b4447a3aa7026982ce95b7e6e04ea0