Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b0fa31cd6f5835…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 13:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a262eb449b20cd3b46244c861fa7c67 SHA-1: b94406233eff5774dc62f9049b456ad7271d22c4 SHA-256: 50b0fa31cd6f5835974a7a83d8c6ff740e9daa3fe9871b01a9868972647750fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=android+studio+add+real+device PDF link annotation
    • http://sanchariglobal.com/userfiles/file/talanetemupozoge.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/94666671645.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/mipow.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/suwawosomu.pdfIn PDF document text
    • http://retailcop.ca/files/98827061659.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/69875173669.pdfIn PDF document text
    • http://moretonassets.net/userfiles/vojimujijanevigijimi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/dewetubig.pdfIn PDF document text
    • https://angkalaris.com/contents/files/jorogelutoje.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/35243686998.pdfIn PDF document text
    • http://vswet.ru/f/nisiwogiberagejudalatub.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/39798499426.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614634a2eeebc---20071593994.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/fe948333d554afc6e1c31d9065815b88/9759331514.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/907475144.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/volev.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/xepogexo.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/54731582263.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/jixewugoviluwudur.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210909_030917.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109101018245392.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/61424989017.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/pogoparamusubomulemix.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/xibobirasugaralefugifil.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://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_off0000ca3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3B 10512 bytes
SHA-256: 1e6b1b6bbe847425a5f313a1d7efbb4916e4ff5f876a6a1190aa78c36e3fb635
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6A 17552 bytes
SHA-256: 79a5ba7ad5b1a59e701cf7f994a2e7b79772e116232bbd5daaece804c61e5e35

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