Malicious PDF — malware analysis report

Static analysis result for SHA-256 1323fdfdda489e08…

MALICIOUS

PDF

87.0 KB Created: 2021-03-17 07:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd54e2eea5db84ed7d296d6dfb70a326 SHA-1: 9f138288d9db21645596d427fdd5a991778817b9 SHA-256: 1323fdfdda489e0843e0d0a9a4ddd75ea580dda711903cc437e5262519e347f1
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/award?keyword=cathryn+fox+libros+pdf PDF link annotation
    • https://cdn.sqhk.co/nulusezitelo/Agehige/ww2_battle_simulator_unlimited_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/mikibitugusu/bihDgfX/entry_level_marketing_analyst_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/gcja5tv/kogiwulusuwimalojotemuv.pdfIn PDF document text
    • http://piroluzufu.iblogger.org/50259666905.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/ijzs679/hilda_creatures_all_creatures.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/hcGDpia/emergency_alarm_for_elderly.pdfIn PDF document text
    • https://cdn.sqhk.co/fogizotufijo/HhhLFhg/23900980432.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/hjqPjco/gedoxesi.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/gehhfno/pijepanufobidekatad.pdfIn PDF document text
    • https://cdn.sqhk.co/lopedovev/hdM6af9/extreme_landings_pro_free_download_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gfpkFbD/33838341970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_f85b7a12a3184de8a3570b3770702c97.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_73cdd683fbc74830a55f16f95f798792.pdf?index=trueIn PDF document text
    • http://gateguka.epizy.com/bojobobeliminotolapuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a480b0-f2ab-4242-8a4b-d8227c75ab0a/how_to_create_a_heightmap_in_photoshop.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_9d164a0d764c44b3ade22ff6e3dce833.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c06ff4e-9fce-437b-9d8c-2e913630064f/66415082685.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c8543daf2874443dbdcadd748a1d42ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/324fa9be-a435-41c0-9c69-9994b8014c66/jeletakufofovurilunana.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_8ce96f1b86ec425cb96f2394d4bba68c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f574ca-1bdd-4957-9e56-bf94c0e709ea/vosavago.pdfIn PDF document text
    • http://gegavenenuzoba.epizy.com/turkey_brook_park_map.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_09ad4dc8573d47939376b35d4fa31b36.pdf?index=trueIn PDF document text
    • http://tirujukixiw.epizy.com/bomovuxibogaxodatigilab.pdfIn PDF document text
    • http://lebozid.epizy.com/89011266439.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_6d022620a3ea4f5791a17f3516221f89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ac42e2-d371-4a6a-b64f-88c8f20ec946/murojunufojerefawanu.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_d5080c6c3a4442cba526d48b39dddd6f.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_1a60a2a698f6477ba3b6d825bdea271c.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 5344 bytes
SHA-256: 8c66f9589988cf4895bb4305fd2130b594f19fb7eb76c2e600ea7093b8aa1bb6
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 11444 bytes
SHA-256: b1efb8a51ffe09270ce0977e525ca1627897e5dae6eaf6b9a5d659361f8019e7
font_02_sfnt_off000134da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DA 16740 bytes
SHA-256: 70938966f78303c19b1a4b2c4fdbce5bd4c0d3b99de8cbd76d60c6a5824dd78e