Malicious PDF — malware analysis report

Static analysis result for SHA-256 9859cb4410f3baba…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 14:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0a4b7f66ae67dc72a150684d5948fd2 SHA-1: b21091ed15abd2f8a710874a47747658873504ec SHA-256: 9859cb4410f3baba5c2b3c0e458d5716b4b9fccae7ca3113fbdc59da5b64d624
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate the PDF contains a link farm on disposable hosting and instructs users to scan a QR code, consistent with phishing lures. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yejida.com/userfiles/file/19131910058.pdf In PDF document text
    • http://civicwomen.com/ckfiles/files/74821754085.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/24853441218.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/xebafuba.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/96144821272.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/bimir.pdfIn PDF document text
    • http://esen.life/userfiles/file/sabumitizinekodawakojajep.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nafixozibor.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/sozulizabesori.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/69728590649.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/93328507297.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/89341106837.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/banuguzi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be5970b77---43112901554.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/22319567274.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/27115006575.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140812cb7---76705042543.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/karigulogidakitemuti.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/53018699720.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/beridiwamebabonojag.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/59193427060.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/55138129020.pdfIn PDF document text
    • https://fptica.ru/images/file/kexosel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=come+leggere+il+codice+qr+con+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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 18000 bytes
SHA-256: fb0d69da8dec51a3b8189c10510f3b05b9cc6f1dceb7e0c142d08e157b9e251b
font_01_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13192 10624 bytes
SHA-256: 8d67297a24cc8122197946b981a5638840a320cecb760a92c5ff53f1c6419d91

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