Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02ed4646c95edd2…

MALICIOUS

PDF

71.6 KB Created: 2021-02-24 10:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ee81fadb10caeba0bb8ef3db505c81c4 SHA-1: dc30aafdb381f7793311b230ee928a23e7eca6af SHA-256: a02ed4646c95edd2a52128081df092630f95be7e8c38d0b9be052f45aec3cf46
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=nortel+phone+manual+1120e PDF link annotation
    • http://ninudogexefeg.22web.org/karuveju.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/afb9d583d.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/bisob.pdfIn PDF document text
    • https://magenudelekoj.weebly.com/uploads/1/3/5/9/135975171/puwoxadar_gosudipaxef_nulupotiladelik_zitevakedi.pdfIn PDF document text
    • http://normaa-id.com/how_do_they_insert_a_cochlear_implantfm10p.pdfIn PDF document text
    • http://znatural.space/27580488321oofhs.pdfIn PDF document text
    • http://vsspb.ru/captain_tsubasa_zero_global_apk3qso0.pdfIn PDF document text
    • http://uanews.website/how_to_fix_a_washing_machine_agitatortio14.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/7789399.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/dhaiihf/winunugijitekoz.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/ff2eccd71601c86.pdfIn PDF document text
    • http://welutotadaxol.iblogger.org/gayhurst_school_gerrards_cross_ofsted_report.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/Bzqhbib/38179371805.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/161a1a8034d02.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/excel_vba_go_to_end_of_sheet3fwzp.pdfIn PDF document text
    • https://ranefegol.weebly.com/uploads/1/3/4/4/134498511/sidefodegojiwi-popiwefadubuv-vixepepinure-sawop.pdfIn PDF document text
    • http://doporujela.iblogger.org/69718737604.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/hdQXjjV/best_word_game_to_play_with_friends_online.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/ihjavSj/9902237804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilivarowazu.rf.gd/kiginazozuramafipi.pdfIn PDF document text
    • http://dopamirep.epizy.com/aws_cli_file_from_bucket.pdfIn PDF document text
    • http://nuzowudip.rf.gd/barcelona_bus_turistic_map.pdfIn PDF document text
    • http://lejemerane.epizy.com/sistema_endocrino_organos_y_sus_funciones.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_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 5176 bytes
SHA-256: 6bef4cde0af9e59e039a3e6dd61087999683cd3615fbcaae47d80a3f9f5c11d3
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10692 bytes
SHA-256: 20f19ba46f3a0c60ac53aafa4717e68414beaa30d6ca11b6f48771be07b3bbd6