Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7e5cdb79344b4a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 08:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2256df976c7da7e6a1089f0a58a96f9e SHA-1: b62f229db5d4e35d0b174cf14cc724f69581cfd0 SHA-256: 7f7e5cdb79344b4a12477a7ccfdeca3c31e6fbe0a4ee60e5d01b6b7a0f7a2d78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=home+assistant+ip+webcam PDF link annotation
    • http://yyfxsw.com/upload/files/zinamiwoluduparefikaw.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/kunidukukususag.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/15a7f8e932f1a0a2d4cb5ad712d4ca31/18416066549.pdfIn PDF document text
    • http://whatdwellswithin.com/file/rebugusinilaloku.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/34413072981.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kivedifakazu.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/68902388328.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/sudosibavode.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zipumoriwolej.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/abdd07cf531e3b94c216da33cf454cde/57186614258.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/nizesawunexazotelukaku.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/mofositugiruranevarewojaf.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/wajuwutelanajivuzilefesu.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/43643264628.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/mokijo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zusenazosejuzopaxijotez.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/35751494653.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54757061014.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tovubizodigolat.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/93721813845.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/xozemejimufugin.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/18511961330.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/85543227376.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/zawatatodu.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/dawijelupese.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/muzudekajogiriteje.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_off0000cf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF08 10604 bytes
SHA-256: 54665b2c26e069fc82eae85095e9485456ce6b5e90f8b03415e9cceabb7554b2
font_01_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 17120 bytes
SHA-256: b3c046b4df06494ae073c7dbd6317db59e9f2b67ab813449cd4a522643702c63
font_02_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1