Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66b510f7e309b31…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 13:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be7c01a0f7870f4aedfcb9a12ea4b829 SHA-1: 77cafd22398c836992736743807fb24cc22d3559 SHA-256: f66b510f7e309b31c423ec3fab8b928a929c509ab9b458ce97ac3c917caee587
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'inwebjor.ru', suggesting it functions as a lure to redirect users to potentially malicious websites. The PDF structure and embedded links are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=40+chances+pdf PDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nogunoboxerazexe.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/39817471320.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/mivekon.pdfIn PDF document text
    • http://vucert.vn/uploads/files/70156059464.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/wifudenadobisokukukoxiz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee4114a52---vokotuzewakanezuvumosum.pdfIn PDF document text
    • http://unsersohn.com/images/file/repepesu.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/gifijamubokeb.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/wamunotopazabagorole.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/74172061116.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/38665924160.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/desezizobezokagasemi.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/xinofej.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/35623289881.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/12402166140.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/23729815014.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/wupewagaketifed.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/17998096639.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121ece593---33976666575.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/88796600823.pdfIn PDF document text
    • http://inistor.com/ufiles/files/99530674595.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/44375704680.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/37311912012.pdfIn PDF document text
    • https://brukspec.pl/upload/file/radovedaribir.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/90445072003.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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 18312 bytes
SHA-256: 377fbf2350729f590205e854c14f68f447dfe0b4f1e94b271de1ad2e61464655
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 10364 bytes
SHA-256: cf9c8f8a9d9800666c1caa1b6e319b6df4eae0c1e6714820b92c6c2eaf45a6d7
font_02_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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