Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cef5eb1a3df60e…

MALICIOUS

PDF

89.8 KB Created: 2021-09-09 08:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbd4ca1a682e00e3a4cd229b62a74a76 SHA-1: af42c6514fe90f85c4cd3f304bb6857bb2352621 SHA-256: 03cef5eb1a3df60ef71279d407ba2a3746d94be23ac4c58f2b67f8151ed4dcc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest it's designed to redirect users to potentially harmful sites.

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://medvor.ru/uplcv?utm_term=is+spinach+high+in+potassium+and+phosphorus PDF link annotation
    • http://straub-online.ch/userfiles/files/5071017702.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/duwebemiridunekibat.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/bakilomeditokuraxotig.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/40394776517.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/10443539196.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/ponoxefape.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/vejelesejug.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/mujavevitibikedorediju.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lidokasix.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/20287567916.pdfIn PDF document text
    • http://tfforming.ru/d/files/77414938806.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/jododo.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/gagarixosozoxorogewetovof.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/37142695384.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/tupejunezulawuloxitukiw.pdfIn PDF document text
    • http://rrarental.org/upload/file/sigutumus.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ceb02538a---50904387369.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/19049252331.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/56037137146.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/13768940511.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/17944084220.pdfIn PDF document text
    • https://digireg.pl/upload/76877291305.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_off0000fc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 10832 bytes
SHA-256: a8355bb3357f781d2cc8d319e24c3c9fa6fa83670924e1a09787271c05d2b4e0
font_02_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 17208 bytes
SHA-256: 878634c93ef276e161e9076d712b2ce377ae25a37f37ce6249d033b0821b0d13

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