Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44fc76adfa9fde9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 03:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bc709251a73a2969d1bf7448341fc76 SHA-1: 2e7b9512e50c35711b05fcf71f7fe00ff0310efe SHA-256: f44fc76adfa9fde9b4add6090079387a3d22584ece51931e36557ef335e6a2c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://studioarclab.eu/userfiles/files/nojosevovukipozem.pdf In PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/12275641450.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/zixuziluzobejajojaluwom.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/liwawo.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/refepidusujesawimub.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30044112086.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/33599626817.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/79323659627.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/lixopiraferasuwo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/fesaxupukopek.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/rufekirof.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/66647977510.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614206c74a15d---21848483201.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/panogelazetav.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/79896466300.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/morex.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/21881338295.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/19491652153.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eca2db5d18319f0767a1a6c9b984aa28/rufaz.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/86285706138.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910164430.pdfIn PDF document text
    • http://markone-tools.com/upload/files/99946021843.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/27535708189.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/46570418641.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/lotelan.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/70244942774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+unlock+moto+z4+verizonPDF 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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 10536 bytes
SHA-256: 4a427850868b1458b38a55b05c4a6be326a8d0ea39856e8e0690e3817ae542c3
font_01_sfnt_off0000f7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D5 19580 bytes
SHA-256: 7f8dab38a76b9910c47874dfb15e34ce81ecebd707187a6562d4fc61c8c87d8b
font_02_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1