Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ade8cb1d39d6a8…

MALICIOUS

PDF

84.4 KB Created: 2021-05-02 20:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: db7f2c69ef67f907a60908e3664e4672 SHA-1: 242cbb8bf2c5b5a7e136386e94ccd4d0c0fa91cf SHA-256: e3ade8cb1d39d6a81044b76b90f38c5b310be16479202b66cfc4f12460c0bed2
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or distributing further malware. The embedded URL 'https://xajibur.ru/strik?utm_term=sig+sauer+p365+leather+holster' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=sig+sauer+p365+leather+holster PDF link annotation
    • http://kawapofog.iblogger.org/sesifomutozesugum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_602e257349233.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/ahgsiik/22475034321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fdb1a239668a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5fea354de7e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_604ca538697f8.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/3d7JgdQ/kotipomixiz.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/gartner_report_on_cloud_security.pdfIn PDF document text
    • http://sorumokujegir.iblogger.org/givoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_470156266c534c479ea2b633d3d8fc4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e50bcdb-bb91-4c70-8158-493d131169e0/how_do_you_write_a_short_film_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/608b577d-08a7-4bb1-bebf-5f1f1575c247/pobre_ana_english_translation_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed1163a-4319-4c94-9f0e-843043da1095/garmin_nuvi_2797_replacement_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef517b2-ea5c-451c-b283-05e97de0f998/13101260141.pdfIn PDF document text
    • http://puxedevonizu.epizy.com/simple_basic_c_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e036f93-f164-4e07-bb35-e6b568eec655/liregekemu.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_28a2bd2ed212409e81a559eafdef6070.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850baee-f00b-4e03-a789-f9594807f1d7/the_end_of_dieting_by_dr._joel_fuhrman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962f4e5a-a971-49ae-b014-6dbef7a45611/64513179533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a97053-778c-46f8-976a-d24e2045cbf7/toroxuxagezav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7888150f-5870-4871-b03d-6baf20590edc/my_cloud_mirror_dashboard_mac.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 5628 bytes
SHA-256: 6612eec342ded3af29e3835df69a511d5fe927df70893ebda4668bb854629afc
font_01_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 12104 bytes
SHA-256: 3c15ed4ed1ddbc14b17557d8d73c208c10fea1b266d851c01c4cb28fb6202c50