Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8abcbfde4199af0…

MALICIOUS

PDF

80.2 KB Created: 2021-10-20 18:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1c779f81e197b1113460b73ccf3839de SHA-1: 21067946d0a72bae39389120baf5a70225768fa5 SHA-256: a8abcbfde4199af0d9604c8efb8f661e91cac2d752d241729c35cdadf6f45aad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable hosting, and is identified as a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infypos.com/infyposcms/media/naxijum.pdf In PDF document text
    • http://tandartsindex.nl/images/uploads/50213898926.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/43332064433.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/14796756097.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/gipivafirojezojolulifo.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210915201515.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/85114876459.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/nogajutad.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/69011462125.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/puvegowuduk.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/widinonekujuxo.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/sinilorawodizit.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/notomegonovegeli.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m4ggtc9cbte49jm4t8crco3f51/dozejomajajiputo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f7ced9eb939c7a0e6bcb4639793b7c39/bulogematud.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/muvifadipujilozazotare.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/84867571813.pdfIn PDF document text
    • http://njchemland.com/upload/files/17919946648.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/38757029367.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/lutidomemav.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/xewitobulemalanuritiv.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/mevovomivefuvimejuli.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=airboat+through+the+evergladesPDF 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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 17388 bytes
SHA-256: deb46fb2a8a1e810aff24a632fb2adf1c1420352f7e2a255f7cf56ca02ef20f7
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 10708 bytes
SHA-256: f88f97827fbcc451cc04e2589e111633aa5ff74861acbfc7b2666946608480e9