Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf8404183db3959…

MALICIOUS

PDF

152.9 KB Created: 2021-10-05 23:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81e51754a6eb856ae92941d76e95e8b2 SHA-1: 5fcb6614f4704d4ac2556238d3f43c24319fefae SHA-256: fdf8404183db3959ba3ea68cf910b9506cb3cb796b92375ef78e9a623734abce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://allytemp.ru/uplcv?utm_term=i+am+satisfied+meaning PDF link annotation
    • http://eros-arena.name/eros/userfiles/file/46550682382.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/tupaj.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/25c2cb9f438587aabe739327bbed8ce2/46980196681.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/45414523168.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/panidosoxinonaguzonig.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/72820006066.pdfIn PDF document text
    • https://digireg.es/upload/11680692290.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/2192998864.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/26116641127.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/175061236130e65e14797.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/78186130452.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/zimemu.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/sisovew.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jalowukufodogi.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/maridaseruxe.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/fepojuzus.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/9147637442.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/30720466997.pdfIn PDF document text
    • http://zeci.nl/im/image/sipamibifi.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/36304019876.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/63829543306.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/mumaredokimajedotoduvib.pdfIn PDF document text
    • https://justtigers.com/cmswithfiles/file/wirogoloremapidagevoj.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_off0001ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2061F 10380 bytes
SHA-256: c3930722ac587f4e82af9dc5ce34dca9bdcccb1c27f9bc558da7fd6ba62a7b95
font_02_sfnt_off00021d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D5C 21952 bytes
SHA-256: 1300b1a338474ddfc0f7e50392ffc8f9abffa68e42b89f7e90b9feca9c309638

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