Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48036f2a6058707…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 01:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f629f197b2f88af5e5cc2fcd6799c0e8 SHA-1: 12cd14e417623484d28b2495774c4cba54f475bf SHA-256: a48036f2a60587073e2a7a5af62947c288b9304ec2692c98526bfc380d688054
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://securitydm.com/slicice/file/63226362314.pdf In PDF document text
    • http://kbchina.de/upload/jowib.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/nizixozuwidaloj.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/41406752430.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109102253273434.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/lutexugabusivebotuli.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/zukajibuderejuduwizema.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kalisitigunimufujo.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/87641670249.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/71488034879.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff2c29b5e---wuzakoz.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tatojojigemupemuwa.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/14934437429.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/zezimozamizutobag.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99609535242.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210910192523.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kudubenunugovulob.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/42814075217.pdfIn PDF document text
    • https://vitanov.rs/files/vubemabobarasenatoj.pdfIn PDF document text
    • https://maisonforville.be/documents/file/46929206476.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131551780778---19581866365.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fupejovenilato.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/10140932583.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/lokutiguvuvipavarezimafo.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/goxezamafepikobuxolokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+edittext+disable+inputPDF 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_off0000c494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 17680 bytes
SHA-256: 6d6eadf2bc89e4434a38a90a7de7f0e49f91dbe32207133ad899a8ab08b2313e
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 10708 bytes
SHA-256: c54ee12cde7f32ae6f8a4079c44c8877bac000b64240543c1225d72cd1ce06c0