Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf22056acff8c020…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 00:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88edce278357de4e86186fc74fb596c2 SHA-1: d90e355e1fee402675796938070954e1fac9f33e SHA-256: cf22056acff8c02065df4b48186a5c40db0fb25a049b77dfb3f5fd8b0f0f6fe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wasael.com/userfiles/file/mufedaluwugexakojowewi.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/97455515273.pdfIn PDF document text
    • http://vtaky.sk/media/file/fatuwalirutiwupip.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/14695744524.pdfIn PDF document text
    • https://electroagro.es/pub/files/27332328436.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/6407306495.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/32218105463.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/mekekakodijax.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/22922497505.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/puveme.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/sonuxaworafo.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///mibapodofebosubenop.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/daxuk.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/varegaketajip.pdfIn PDF document text
    • https://mashura.co/userfiles/files/sixekirivavutolavilize.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xadada.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/13634747910.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/66838907889.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/potafasewox.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d6c254db4---33435864445.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/liwupiserofalesokoloroke.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorolifediv.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/junukubajupamo.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/38481122035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=schaum+series+matrices+pdfPDF 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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10792 bytes
SHA-256: 491a24b572bd7fe024867aaa93c9336ab93313210dec00e9c61cadfa3e24de80
font_02_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 17832 bytes
SHA-256: 399e7ed764df0f2c968023d3885fa2a60133857177bed77d23b8c1678f511dfa