Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be8755da068631f…

MALICIOUS

PDF

73.2 KB Created: 2021-05-15 10:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e8b24f7d048d367e4f236cb8990c1e66 SHA-1: 233c52d58424e25e678db99602e3d871f3f04e11 SHA-256: 4be8755da068631ffa63f286a1ac3aa88b5a9fcaab0581bedaea87574eb1a1c6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=financial+algebra+textbook+pdf PDF link annotation
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/mibasojogo.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/7544377.pdfIn PDF document text
    • https://cdn.sqhk.co/xorudonox/fghKyVR/distillation_column_design_report.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/how_to_unlock_lg_tracfone_wireless.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/sound_of_music_conductor_score.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/jhccRLH/wofesawiko.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/nulat.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/hdhd0bS/59844032227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6773b89-f111-45a0-89d8-efc45bbbf710/segoxowugabemuxugubuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ef1ef7-1afa-4226-9460-68c461dee9f0/which_trimmer_is_best_in_india.pdfIn PDF document text
    • http://noratev.myartsonline.com/yaskawa_a1000_alarm_codes_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c43f725-a778-48b0-83fd-ba7acd6499a6/37836146773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9381678c-7e8c-4ed6-a3f9-77ae991fa50f/68850859330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d576848d-9d52-4bb5-b4d3-d8e64dbe8c33/intro_a_dressage_test_with_diagrams.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/zepedilivelejepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122dab9a-3af6-4cfa-a734-8234a93335e9/slicing_pie_model_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d455cc06-73e4-48ae-a02a-cd4cb18fbc30/how_to_calculate_molar_mass_of_h2o.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/gafibisanosisaguserezef.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/naruto_shippuden_storm_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/45128994121.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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 5372 bytes
SHA-256: 5f46d82dc3221e43a486956f4e67901614d63290aa837dd3c95c8d75b631689a
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 11968 bytes
SHA-256: 30659680fb7f12c03b47d46a8bb0c11104a3a8f487b6451aaaa6fbc9c4063dd0