Malicious PDF — malware analysis report

Static analysis result for SHA-256 686efa6b1086e1a3…

MALICIOUS

PDF

88.9 KB Created: 2021-03-23 09:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5cbf80dd82dc61314e760bab6e08194b SHA-1: c3f7ecfca3ae121df53de6f375a5d2bdac1f44e1 SHA-256: 686efa6b1086e1a3659f2f341d256b7dd799f29c2ec2a2ba0457b0a7f6c639e2
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=chinese+drama+app+for+android PDF link annotation
    • https://kofiserifopame.weebly.com/uploads/1/3/2/7/132741397/zanefif.pdfIn PDF document text
    • http://uscreditmonitoring.info/data_analytics_manager_salary_nyc5wq9f.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/ea983f.pdfIn PDF document text
    • http://metalllift.ru/o_que__substantivo_uniforme_sobrecomumjtmtp.pdfIn PDF document text
    • http://atlas-copco.su/xovinolujapatofegidipp2leb.pdfIn PDF document text
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/sivutaxinuk.pdfIn PDF document text
    • http://tibetterrier.ru/48814052965xnant.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/e727b26a-6bca-47eb-bb9d-46fb8fec9b47/xewojelupidesuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6cd3de-ce2b-4afc-8bfd-00b3357e3807/32115373050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e3e8fb-41be-4ac4-9aea-cb9553148505/fodewalopaxifovogubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3641a8-fb3d-4165-9cda-961f856ca262/13288992186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f43104e-1ba1-4c2d-9d9d-9f8abd47b08f/44207108563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff44450-d7ae-4c9f-aeae-d39e19f00ccc/xaxutinime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a993ba-ef10-4414-b3e9-86facd8dc8d1/kemper_profiler_power_rack_rackmount_guitar_amplifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df4d09d-6cf5-49c4-adcc-d199222bf2f6/wiwojebifufume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf059b4-c18a-49b0-b6c6-ce8338319ac8/34265207868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6367458f-cbe2-4622-92ba-83e33b975c54/buvuzavudisebiligor.pdfIn PDF document text
    • http://kavonuloruzofeb.rf.gd/wenadudegikopumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f0ec91-9fab-48cd-9f88-775d269bcecf/53655694179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597c21d6-aa44-4066-a4a9-57288d785840/pozutinipowenimaxotarofuw.pdfIn PDF document text
    • http://nalirabagetovop.epizy.com/game_boom_beach_mod_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4ce5e0-6859-44c4-858d-49d55b754913/girl_scout_animal_badge_requirements.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_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 12220 bytes
SHA-256: ce61b9dda8d32ca1e4b9b4fae384a4c8e55bc19594a99e2f1bcfd9c40f700cb4
font_01_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 5152 bytes
SHA-256: 76588c18cfb98281213ceb51fdb3b2c5d865c8de47bdcd13aa8797ad1c798602
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 12064 bytes
SHA-256: 897629bcb00b07332c476fcaa02251ca88ee7341436bc5d63d6b5244547a16a4