Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afe6f52988b8e5b…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 09:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00670f1d1ae039128c695906e090c590 SHA-1: ecb53b14619d9572c9644a0f83fd54f163036738 SHA-256: 5afe6f52988b8e5bfccae27d52b92fcabe30ba08c98d00448175cfed92eec102
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=demoralized+meaning+in+marathi PDF link annotation
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/mejisiro.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xivaferelewoxamudegaxonak.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/30312347084.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/17231270127.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rukukobiwazida.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154334df052f---5991669119.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/97127997349.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/84027803276.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sosip.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/49033958866.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/kalaxivizos.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/52677961270.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/70522667904.pdfIn PDF document text
    • https://aleemanschools.org/userfiles/file/13169219799.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/seworozi.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/galuzilanuvizojaxu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/simiw.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zepip.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/foxedasij.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5dac660df---86188718022.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/vorurejebirunuwe.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/neduvatudazi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gajogem.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/96954541954.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/puvubakepexesos.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/51161263557.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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 10588 bytes
SHA-256: f1ddc3010705f7d0476e879cc9a19771e93a06041de0630b92c284d3f1c56b88
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 18760 bytes
SHA-256: 1b993271304912f7a9b6958f9edaf5f3b46e4f110d272d0718c0d6f99cee4491
font_02_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1