Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf20f9a88fb5fcc6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-08 20:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ecfc9a0b7fa4317fda91dbe59599812 SHA-1: 58edef45c02a7a9e6f47cc7f2c0ebd7bc62cb251 SHA-256: bf20f9a88fb5fcc60a4ef52bd9e6507d4465fd62bc2c0dc999c6ef33df0e19a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document acts as a link farm. No scripts were extracted, but the overall structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=life+cycle+of+a+butterfly+ks1+worksheet PDF link annotation
    • http://www.ondebiz.com/userfiles/file/nopaki.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/8519678851.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/sumuneruxedodidezeregog.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fevitutejozexusotekebupu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135fb9ec685d---jutizuvudugox.pdfIn PDF document text
    • http://rapet.hu/files/juvutuvulevukaju.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/bokisa.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/xuregatusorekuvulazigubak.pdfIn PDF document text
    • http://santeh.md/img/files/66178348641.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/sajikomixeliv.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/sakeweduxobodenedewufezu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/40533158720.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/lubisofid.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/tenoloxulazepurabafewu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/wezemiduxasulafower.pdfIn PDF document text
    • http://rococosofa.com/files/files/25023796045.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zudakanoti.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/popikibizisuvupuvifukiwon.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136880bb5bb8---66577509565.pdfIn PDF document text
    • https://kenadong.com/contents/files/33028347592.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0e8858e76cde1e5f6758a3a2e12e93da/femozumuwas.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/34230550696.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/64033052470.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_off0000b5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFE 10872 bytes
SHA-256: 5ad930030a3b86fc5b4d5ce33e1d69bcf50f49cb8fa6d78388e4118989aedf1c
font_02_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 15524 bytes
SHA-256: bdcc0deb3b45845160fa7c722eb56e9617643f1d28965bb9c6fb84f3fb6b60f8

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