Malicious PDF — malware analysis report

Static analysis result for SHA-256 f200d3f708fab916…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 18:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac071791591d154a094d622084dbabb7 SHA-1: 4827bb2a67183eb3bedffbd3e59aceacdc4306a1 SHA-256: f200d3f708fab9168478fc80b7ebaa80471e9c49644df5c8064cda1e5ac6486a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through redirection, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=resso+prime+apk PDF link annotation
    • http://enjoy.sk/editor_uploads/system/files/zokedimufowamud.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/musisewixuwoniraxarosus.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/watiwevotof.pdfIn PDF document text
    • https://bunianco.com/other_files/File/vidixawadupomuwabapex.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161498813c8e63---zitomu.pdfIn PDF document text
    • https://stopserv.ru/files/file/lijavevowol.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/37841723674.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe4457ffb---47589453341.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/87934189378.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/79632537933.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/wifaxu.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/87465894552.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/xawukafapewufuxuwanipi.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/xidukexibiwoloxabok.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/75887208761.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/kafoduvavofebenimuvedifaw.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/muxufoxapiza.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/timono.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/19708899376.pdfIn PDF document text
    • http://wohingltd.com/userfiles/62150234690.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210915165553.pdfIn PDF document text
    • http://4bx.pl/public/file/68394168320.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/mamosiduwidag.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/42ru11due75thledta2ok0ndr3/79800410642.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/67003484882.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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 10304 bytes
SHA-256: 27711fcdd62c7d0a50000144674f670fb89a4199f4c66697a18cb311f416572d
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 18424 bytes
SHA-256: 94e1accf449ddb9d3bef6e59543e990b0ab9fafaa6e3743e4df8008a7ba5d713