Malicious PDF — malware analysis report

Static analysis result for SHA-256 905276121eb87e86…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 02:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dfde40e27d12484a412595332f9ce2c7 SHA-1: d4fc798c7d057b6b40eeae106d05f1237bedfb5f SHA-256: 905276121eb87e861e35d6e6011bde9ac2ada4fef34c146536c38480fd11a42d
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to redirect users, and the presence of numerous unknown URLs supports this. The document body is heavily obfuscated and unreadable, but the overall structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fapannimario.it/userfiles/files/76888113863.pdf In PDF document text
    • https://pmfegypt.com/userfiles/files/pozunuvuwojamova.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/raximibuz.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/sisibobofidevusuvekasisa.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/manawodutadifaxiguxero.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/93050360937.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/38233496861.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e48adb0ea---libifolezekopedifubovata.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/dafedozelofuv.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/82164600771.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a8d5b4c9---mapetixowubij.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/ponitivusapogajevov.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/tufubazomodeveri.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/givobogosizexubos.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/50881181042.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xujurolitazisavurifok.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/78130284792.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/falimapew.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/42271296007.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/numisoni.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/52464730876.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/48885767930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shadow+strike+mod+apkPDF 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_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 20140 bytes
SHA-256: 4b5add3fb9bedac196cafbd5d00c2e719d998c9cc33b028e953bb0e83bc472f2
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10760 bytes
SHA-256: cf58420e0de570449d087da89edae9c67d71b82b81ef9566c5099c0fa1a050a3

Open this report in the interactive analyzer, or submit your own file for analysis.