Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb18738935d3f82…

MALICIOUS

PDF

72.8 KB Created: 2021-03-21 20:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3a4151f13b7a164568664cf05d0f610b SHA-1: c4a5a59c5121d65bd8d7e904963bf96e37cdc355 SHA-256: 2cb18738935d3f8272b364812503348c353f25a565d80a5065da6dbcf1ffd9d0
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous external URIs, including one pointing to a disposable hosting domain, suggesting a link farm or phishing attempt. The PDF document body is heavily obfuscated, but the presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://jumiwimov.ru/award?keyword=writing+and+solving+linear+equations+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460251/normal_601093b7086b9.pdfIn PDF document text
    • http://tamakar.tech/jupoxaxumuzib43k.pdfIn PDF document text
    • http://creamspait.xyz/pidexowrbqc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_604cd82d4198b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5fc715dee634b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_60262b79928ea.pdfIn PDF document text
    • https://cdn.sqhk.co/zapevexuvot/RhhgiPK/star_wars_kotor_character_not_moving.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6046c5a85cb79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381105/normal_5fee9ebe88c51.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/egjcbJz/tuxera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_6049177a2f368.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/gi5xjcX/puvotewolijamik.pdfIn PDF document text
    • http://daliadiago.com/4559718374vjyb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6056b9b115b61.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/sifepogok.pdfIn PDF document text
    • http://activa-fb.com/fatinajojukexu42v8s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5fce570a576fd.pdfIn PDF document text
    • http://pro-konditer.com/javebutulilizifexusatiqj0nx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/1799565897.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/windows_app_store_for_pc_free.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/33798667056.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/comptia_network_n10-007_exam_questions_and_answers_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/81890276774.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/xasuxodiwa.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_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 5656 bytes
SHA-256: 01496b74ed8ebeaa0d177cd205db3130da45b2f1b69a5b336a1ec249014606fa
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10492 bytes
SHA-256: 9eaca7cd130ce63c0fe213d8c95c0695d818c88fc3e09632c5260171db48772c

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