Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7335b761dedcfd7…

MALICIOUS

PDF

76.7 KB Created: 2021-05-30 08:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9a40e978214a6f66642a09f4e85d576e SHA-1: e797fe6d475f440ffa21eb8f773c3b96719cb29d SHA-256: d7335b761dedcfd77f8ca52a32cbbe0b27ad1bcd45f99d8af41c85d3d341d485
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and potentially a trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or spam content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://leonvi.ru/strik?utm_term=exercice+comparer+et+ranger+des+nombres+d%25C3%25A9cimaux+cm1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387808/normal_5ff7f1eb892ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370268/normal_5fde499baa1ac.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/0f707db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5fe07ce7c03b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fd3b36c1c22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_600d2c5acecd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_5fd3407cd90cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_6022212caf0e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_6009a1fd3130b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_602a43277108f.pdfIn PDF document text
    • https://gojaxuwawozupu.weebly.com/uploads/1/3/1/0/131070912/mutuzisuvuvoki.pdfIn PDF document text
    • https://kukapurabu.weebly.com/uploads/1/3/4/3/134375365/refezafuro-tijubaludem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_604d1c22c2e8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3e6a5d87-95b3-4885-b663-bea93d6b81f6/h2o_mop_x5_elite_gztisztt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ecf8246-bd44-4ac8-ba96-2bcfb756606a/dixifanukisemilejef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b11288c-49d4-4dae-96f5-ada69be69bf9/what_is_the_mechanical_efficiency_of_an_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4e389d-1517-4a4b-8a17-fa960564622f/wuredekalemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88887c21-12ef-4d31-80ea-86d735df6a07/church_treasurer_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab10929a-d04d-4e1b-852c-9b73fdbff7f1/ap_world_history_black_death_dbq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ff87f1-0ece-456c-ad7c-2b23926c53a0/hornady_eld-x_6.5_creedmoor_load_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a746658-b44a-49e9-addf-440a4157c7e8/dizzy_gillespie_tin_tin_deo_youtube.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 5600 bytes
SHA-256: f4eaedb905ecf24a73d75acf96ad217ded70ce1b543d09b8f6a6c7d13838e524
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 12176 bytes
SHA-256: c9ed4ee7b61cf0bb9294c4d3ae037a8283f5b970ec054d224915e6fc8943e7fd
font_02_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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