Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3df4af4500f56d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 18:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dad546e749a33fa8f6c2206c38e79bab SHA-1: 5078a18c7306af08c227cadba61480208ca4b227 SHA-256: fd3df4af4500f56ddb521a243987d66f6371b03f33075959ff1865fa76cb7f3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using numerous links on disposable hosting, likely for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vetcasatenovo.it/userfiles/files/woxajetulejoxafi.pdf In PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/22346318603.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/13693518637.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/buxavomi.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/povopefivuzasaronosugivej.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/34742534268.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d872eaa844---90573667816.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210914031718.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/mofajilenuzuweboj.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/53165422160.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/42698655412.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-18/20210918142301729363.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/ruvabanixer.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/60122327772.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/wajapugunazerunidajiguro.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/relunozogojedapuk.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/30833433578.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/lufexopi.pdfIn PDF document text
    • http://xfswchem.com/upload/files/gizopawadiniliwefusalud.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kajajorusuv.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/4049308527.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210917_B4357D1593708CDF.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/54439183224.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/92654730120.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/91114657447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=principles+of+accounting+book+pdfPDF 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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 11128 bytes
SHA-256: 2defed75961783404c3be70454807a72f21253822e8158f06b3499311b690ff7
font_01_sfnt_off0000ebd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 17732 bytes
SHA-256: b9d4a0089c5233daa66b4737feab85c845ef6c1642b77188f9f6aaac2535999d
font_02_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1