Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a0b3c71f276808…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 07:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2454c5eb88ced319e65129387c35faae SHA-1: 39ddef5df4518b8074b858c190745df1052c1170 SHA-256: c3a0b3c71f27680843231d3ebc8b4a268708ec328afddc05920bfdbad49349eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of link farms used to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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 http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/fapad.pdf In PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/zizukasinemag.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/lomitetitabovavaleragiwaw.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/45007073923.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/81100545326.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/17297666219.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/93259319071.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/41909272412.pdfIn PDF document text
    • https://rosycaffe.com/file/tebiraxiguluroneximoz.pdfIn PDF document text
    • http://hmed.vn/upload/files/79785309308.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/lovagupoxofuluk.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/42897720826.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/lowovaxanotuwo.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/venogutodu.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/7606049395.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pugeletari.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/zowututigigewaf.pdfIn PDF document text
    • http://nemochem.cn/upload/files/77298760584.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479b2a85d43---lowovumojipinefedanuta.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/51138847165.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/5245501578.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/josepemuv.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d40e02add---64907289826.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/76649136802.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/31352523582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=diary+of+an+uber+driver+watch+onlinePDF 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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 10912 bytes
SHA-256: ea7acb654cef682537ee22d80c961430567453870b28e84cc14e092636597b7b
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 15688 bytes
SHA-256: bf3ed89b6b3d6510ff3a9717a90c0435ff4ad1dafce39c04a62e2880439218a7
font_02_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1