Malicious PDF — malware analysis report

Static analysis result for SHA-256 f816ab02309c68e8…

MALICIOUS

PDF

82.9 KB Created: 2021-06-07 20:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8135303e228ca576731877f13f744bf4 SHA-1: c97dfc5a0f2b3680688c03334170e50143762bf4 SHA-256: f816ab02309c68e8dffdff1d1cd765d5b6571b05ab246b68bb20013a06196d25
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/pbw?utm_term=paradise+island+mod+apk+revdl PDF link annotation
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/zetubolasosowena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5fd261952705e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_6054430ea1663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fdff83b84430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_60199e34736c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_6042ddbc7b83e.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/9806056.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/kobijajajiradiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6037f2ec2c4c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_60044fcf559af.pdfIn PDF document text
    • https://nunewefumeko.weebly.com/uploads/1/3/4/3/134307525/dofewowu_vofowo_sibokevilabiri.pdfIn PDF document text
    • https://baxodibidixajit.weebly.com/uploads/1/3/5/3/135311382/9f5510cd19e9.pdfIn PDF document text
    • https://modatubegawaso.weebly.com/uploads/1/3/4/4/134491319/5951603.pdfIn PDF document text
    • https://zameleto.weebly.com/uploads/1/3/4/0/134042643/zexubo_kitofebeg_wujakomomuz_mumatimewuxulow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupataved.pbworks.com/f/64375426088.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144472977/how_to_become_a_jag_lawyer.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144445794/descargar_virtual_dj_gratis_para_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548b2f5f-168e-4bcb-a1e9-710ed29e350f/are_government_grants_taxable_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc83921-7b2f-4bce-936c-8e1af41236ee/90782831481.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
    • 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_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 5228 bytes
SHA-256: 5dd52515cc1760e1c154e65119396e85211aab33690ca954584bc4c480fe902c
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 10428 bytes
SHA-256: b7814db66b3a4a757f94b89ddc2dfecd92bff43d8cffe2b4cd5f4814307ecc9e
font_02_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16132 bytes
SHA-256: 5df9a924020f3b47f20d23ec22d8572383feb6ad42681b2b1a3175c3053cc5e6

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