Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c25e19fd0165fe…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 23:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 702f2e6eeb77aebad251db134a3af412 SHA-1: 64df4b81c86243251c07233a1cb2b796f188d200 SHA-256: 99c25e19fd0165fe869ec55d29a04f5de96e4dc53bb53cb6e412fa40b855323b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing unwanted software. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=flipaclip+apk+download PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4defb49a2694d47d90603aa8176235d5/nujogonadirosuzurevivubit.pdfIn PDF document text
    • https://protum.se/file/19625361468.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/lowezepatokotevetakumil.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/2394991095.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/74637637531.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/wobuzumi.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/relofepugijepi.pdfIn PDF document text
    • http://dsagco.com/Upload/file/ratilowaxifegedizu.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/28660846331.pdfIn PDF document text
    • https://camphacement.vn/upload/files/jubitexebefarebubono.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/43111069625.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/39460675512.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/29720857830.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/18126798770.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/50592494736.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/473762972.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/sodabekef.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/rimoduvemozuwub.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/99526005001.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fekupajuvigurudidodojab.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/61182688219.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_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 16796 bytes
SHA-256: c9fbf4e40892ab3174589e9ce439e1ab40bb1703ad07056e5caf90b5e47f29c2
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10164 bytes
SHA-256: c8646eaed1da220d90fb02fbd57f1e45f2eae9b1fc9d8f47f59b5f63369f886f
font_02_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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