Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f97fed5bead1e48…

MALICIOUS

PDF

87.2 KB Created: 2021-03-24 17:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 116460c67377ca68881e493a7db3baac SHA-1: a8e19f7bf35410a042353a7991d8f5726313703a SHA-256: 5f97fed5bead1e48ea6d6c350456cd726790f2876336452ad1426761310639b2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?utm_term=human+all+too+human+a+book+for+free+spirits PDF link annotation
    • http://doctorzlo.com/metozelodegeex3da.pdfIn PDF document text
    • http://55571.ru/zevuke6682l.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/sjjehjo/drift_max_pro_dinero_infinito_2019.pdfIn PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/mudarejozesiju_zavabimos.pdfIn PDF document text
    • https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/8949050.pdfIn PDF document text
    • https://livabobuladezer.weebly.com/uploads/1/3/0/8/130874084/56737a.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/bc89f03a35.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/LlQwghi/connected_classroom_student_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/xP5vhgf/alchemy_fusion_2_solution_francais.pdfIn PDF document text
    • https://tunugezujemis.weebly.com/uploads/1/3/4/3/134307821/kevuruxofubejok.pdfIn PDF document text
    • http://laitlabs.pro/pythonminer7p5m8.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/ibjpTeQ/free_screen_recorder_for_iphone_11.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/1hX9mBA/61223158093.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/fixture_liga_aguila_2020_2.pdfIn PDF document text
    • https://nakebakij.weebly.com/uploads/1/3/5/3/135339599/9915955.pdfIn PDF document text
    • https://webojugobe.weebly.com/uploads/1/3/4/6/134601542/sapasefugaxefeniveg.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/jodudedodinaze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_6fa1c8273839493a9faedfac5dc72fca.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_152cc755f82348cc8b13d6b97d0f6569.pdf?index=trueIn PDF document text
    • http://vegubom.atwebpages.com/kegolesiximo.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_8cab274cd120495283075da3eeffe242.pdf?index=trueIn PDF document text
    • http://xomapagovujux.atwebpages.com/hot_springs_grandee_control_panel.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_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 5308 bytes
SHA-256: 18814b8553e19f0bab2cbac22adb757fd42c310b64266174cd2d063d0bdb194b
font_01_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 12008 bytes
SHA-256: 4d7dca8ad4f2f9ff3ededd4d180a243272838706555f324db73a6882e6ce3e28