Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c11c9f9307143f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 08:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86b5db1105211dba3a762376b83eaf7f SHA-1: c409134b924a76e804eac9273b5dea12e3a6b9a1 SHA-256: d3c11c9f9307143f161ee260775590b21ab8eb0f71c9c97051d736dca3ca5606
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

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://philabc.ru/uplcv?utm_term=folder+view+android PDF link annotation
    • http://boilerservis.ru/uploads/files/83221195356.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-03-12-37-17-Qx36q7Yt.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/golaji.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/40612395654.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/63827797919.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109040815388554.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/jorume.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb172b6425---62536679067.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/18100221320.pdfIn PDF document text
    • https://limsurdua.com/contents/files/vetedoruzolemopu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63572443693.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/f9b1e116b2b6a631cbd205feff431495.pdfIn PDF document text
    • http://gerocuki.hu/user/file/94674358366.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/wesobebi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/senituta.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dadc020ac908e0b41ceee1919c682d63/difokeseku.pdfIn PDF document text
    • http://www.siposferenc.hu/html/40532946818.pdfIn PDF document text
    • https://eurotig.ro/file/gotubijadixifi.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/73854234568.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/sovijipanufobox.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wojitudolamukera.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/pugagatowi.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/domuzixiver.pdfIn PDF document text
    • http://alkanboya.com/files/file///fured.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/3324684165.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_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17340 bytes
SHA-256: aa496afe715125d8ac881ce791d90e79c34be0080d02436e4e18cb48c64963bf
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 10104 bytes
SHA-256: cdd887b851d393fa011f29c20d696125164b9602d379ea2f20303542360a2c0c

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