Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25da3a8fd201dd2…

MALICIOUS

PDF

101.6 KB Created: 2021-10-09 01:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6755c7354b4b4f3b7986ba4f639c848f SHA-1: f92e4b17b079e5e65020fb3e520c39ac3fd7b8e8 SHA-256: d25da3a8fd201dd295c25ecd2b63446b62bc724e17702d12e2dd03d5878ac26b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one specifically identified as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/c5btq261q79k81b51v9heogi47/90464905578.pdf In PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/43997911709.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210926065410.pdfIn PDF document text
    • https://ptogel2.com/contents/files/suzopapaxexarosadixidubu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xejalinazabobenodifusu.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/2217737438.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/jalofamudovixifebamana.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/vuwin.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/lunuwikoweguvotuzi.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/makonofeni.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/13898581057.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/87592527784.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/162f46f7206829852ae2bbc73e2a6b9f/10491951105.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/bodaxeranazen.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/40354348262.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/vomadel.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/65000987647.pdfIn PDF document text
    • https://servicepapik.ro/files/jumidatolekoxe.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vurizuvakefetewagetut.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/50270577947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=turn+off+the+screen+overlay+from+settings+appsPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/wawatumeta.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_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CE 20644 bytes
SHA-256: 111f137683ff5a15428b9c1d8a2e018102138d9761729a1f793759069a3a43a5
font_02_sfnt_off00016ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA5 11168 bytes
SHA-256: 305f739db101eb74439b6ad457a0d979da28f3d11cb7c3df63c16a278e962d14

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