Malicious PDF — malware analysis report

Static analysis result for SHA-256 f925d435f15d74ac…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 11:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd18ca5d97dabeb8942998f0c674656f SHA-1: 24d62278e5fd9319b9abb06e20f444555be8902e SHA-256: f925d435f15d74ac20b36c6ac772427495edccdb0cb50690d92d02f04a13f063
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of these links and the high detection scores suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06d54b497---porumalijurupivimogovel.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad47273b---93504055810.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/98894624057.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/zamogagananuxixuvos.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/16117075190.pdfIn PDF document text
    • https://ka-base.no/images_students/files/wibulafeguke.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/42576277431.pdfIn PDF document text
    • http://195exim.com/datas/files/jogefobesamepif.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rejesu.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/67475604933.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/71713624219.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/61600549499.pdfIn PDF document text
    • https://eclearusa.com/images/file/divakesuso.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/bavotuxojekutodoxanirijod.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/woxarenobumo.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/tuvarewebega.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sodisodefabejonepe.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/patesu.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kagimavodikedek.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pigulivew.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/72636921608.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vubokukofukaxunadonerimul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+screen+record+on+your+androidPDF 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 17900 bytes
SHA-256: b126c68e4971a123d5c31bd12ab483316a9ee359cd31e2c65488321abf39c157
font_02_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 10608 bytes
SHA-256: 835d07bf7e02e35f607c4da616fd7dc7f61a234684a7ea924a97c3feb30aa84c

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