Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2b128c39b00d8d…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 15:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9abac9c1af9ae51ae1323570ff625cee SHA-1: 51fd3ee32ecf5f15465c0673d9172577f3d7b58a SHA-256: fb2b128c39b00d8d915bdc1fee289071e976d82556b71d5a9a6b4f0bfbecdc24
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=romancing+the+balance+sheet+book+pdf+free+download PDF link annotation
    • http://xazonem.22web.org/crash_course_bicameral_congress_answers.pdfIn PDF document text
    • http://xtreme-sport.ru/metal_radio_onlinereyn0.pdfIn PDF document text
    • http://freud.icu/442808430271wjmi.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/gosef.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/1996399105910j0p.pdfIn PDF document text
    • http://korirojasutito.22web.org/fisco_agenda_2020_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/iWidQie/wifovojafikaxutusejogole.pdfIn PDF document text
    • http://jobatuzuru.22web.org/maytag_maxima_dryer_not_starting.pdfIn PDF document text
    • https://gepajalubawif.weebly.com/uploads/1/3/5/3/135326746/fozajefifajo-viginogeke-digutisevemixa-xidatuw.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/qVieP8n/best_gps_speedometer_for_bike.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/a0d7c11b-cc15-48a4-aaa1-ffa1eb239c86/resumen_del_libro_las_batallas_en_el_desierto_capitulo_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365e8a88-1d09-48af-b64c-5c7c211ebe69/27857978473.pdfIn PDF document text
    • http://vagakidid.epizy.com/mixing_red_and_yellow_makes_what_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dd26db-f1d3-4053-8d04-2d30026d08b9/brandenburg_test_wiki.pdfIn PDF document text
    • http://fulisawuxulinis.rf.gd/gattu_battu_music_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807d76b5-7295-435f-979e-58b6ef729969/232027785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e41ba42-338e-41fa-9c8e-e2fe9d08c065/professional_growth_plan_examples_for_music_teachers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e8db0c-e02d-43c9-bf3a-864fb597c1cf/g_shock_watch_change_time_5522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7377a49e-99dc-402a-96f6-b1d8bf42a957/what_are_the_social_problems_in_the_united_states.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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 5872 bytes
SHA-256: 234c6adfeec4120e21098d4fc7eb56d46f82f5412a1640ed25d219d6263b8d8d
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 11272 bytes
SHA-256: c89ab9c7709af0571b36deb71286f57841036d0fbc21fb84a6bdf264f292d3e1

Open this report in the interactive analyzer, or submit your own file for analysis.