Malicious PDF — malware analysis report

Static analysis result for SHA-256 489ee8d5d241a721…

MALICIOUS

PDF

92.3 KB Created: 2021-03-19 06:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 45c84c3e3515985d849e737ec4e99ff6 SHA-1: 7805aab06c8237a50bf6ee8a69b4d73ac4b97898 SHA-256: 489ee8d5d241a721f8bc5b8d162e925aedba0ffba617cfcf34c57427d98fecc9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/strik?utm_term=how+do+you+do+needle+maintenance+on+a+keurig+coffee+pot PDF link annotation
    • https://cdn.sqhk.co/kigimole/tdcBhgu/7207699996.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/RNryhbG/93564169890.pdfIn PDF document text
    • https://cdn.sqhk.co/viposaxa/gfiezFL/shadow_fight_3_pc_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/fXgcteh/2020_football_college_rankings.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/bficjaU/zombie_escape_ship_tampa_fl.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/Yhfjghf/best_video_status_application.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/iijhbjd/14248819889.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/Ajcij6o/simcity_buildit_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/GbAlzij/classical_piano_pieces_in_c_major.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://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_f19f8cf7380e43b7a1c2b7a3c3ad440f.pdf?index=trueIn PDF document text
    • https://0f642c0d-c9ff-444d-8de1-b0511ceb41c3.filesusr.com/ugd/165585_4f8ae81bbd60470d9a9ef604431cdfa0.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_8d94b5a0ede84f0fb8ac0cb1013acd79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a39921-ab38-4f62-96eb-5472e91821ed/rowuwejema.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_f6eef22f5d4c4b7d8da67d98ef768b0f.pdf?index=trueIn PDF document text
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_da4b2b422a634bfb9e3e240c04294237.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5e6ac1-b8c3-4f60-b97f-2e8cec62958f/how_to_reprogram_a_marantec_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0297b715-8ab8-4614-8c93-add608e2d1bb/how_to_fix_samsung_tablet_wifi_wont_turn_on.pdfIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_42956f7cab334ad99fbd5a56a610ba24.pdf?index=trueIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_79b2f859b28241028ba8765f7e992e6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72c1afd-4ab0-4c2a-be89-9426016db8d7/48201419884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d6b10f-a83f-4a52-82f1-5811d513f7fc/verbos_regulares_e_irregulares_en_ingles_pasado_y_presente_simple.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_c534f8b4a6624406b3af75214f584c92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/261d47a4-1c9b-4587-8d37-98a635eac904/mixer_yamaha_mg24_14fx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f2f53f-69ef-415f-981f-01562b847ea3/cuisinart_food_processor_dlc-7_parts.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_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 5396 bytes
SHA-256: 44a5308700a506f1c3f9850acd9e868fe7711a44a648a206d4bfdb15226a8920
font_01_sfnt_off00012d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 11204 bytes
SHA-256: b4a994afb4d1302227ef1b5e4eabcd39861030acfa92807359c1d42dc42c4015
font_02_sfnt_off00015310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15310 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3