Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ad77cf7b9cd373…

MALICIOUS

PDF

77.7 KB Created: 2021-03-19 03:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 91d39e69f740c2b3009496377551bdba SHA-1: 1688916057146094f8e7f2c673e9353ff98540e2 SHA-256: 72ad77cf7b9cd3736bfc9730557cb5be0c18254a7a4d97b308b76c5566ab5926
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 0.9996

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://mezovuduw.ru/wix?keyword=sushi+cat+2+the+great+purrade+cool+math+games PDF link annotation
    • http://xijonofupawulo.mypressonline.com/ancient_greek_olympics_facts.pdfIn PDF document text
    • http://sluzhba1.net/synonym_worksheet_for_grade_318iu8.pdfIn PDF document text
    • http://zespodsvetkoy.site/john_deere_mower_dealers_ukooz3o.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/81653776133.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/verifopajola_gasafafaropijal_sosekamemedeb_jetofi.pdfIn PDF document text
    • http://dezirutumevolu.iblogger.org/vipeveri.pdfIn PDF document text
    • https://vomagorawu.weebly.com/uploads/1/3/4/7/134720662/648bc85893ebb4b.pdfIn PDF document text
    • https://telemoradez.weebly.com/uploads/1/3/1/0/131069753/dajanoz.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/introduo_a_analise_combinatoria_plinio_download.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/bezan-wonivuvosilu-gakeriratafume.pdfIn PDF document text
    • https://wakuwuwosabi.weebly.com/uploads/1/3/0/7/130776519/2841093.pdfIn PDF document text
    • http://mezajozugabaso.getenjoyment.net/butavuvixovizebugaf.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/do_weight_watchers_scales_need_batteries.pdfIn PDF document text
    • http://auto-fishing-rods1.club/dickey_john_m3g_manualzqkkr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopusenegi.epizy.com/network_security_analyst_salary_uk.pdfIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_d4c59fb46a5e49d1b22bddc72a072dcb.pdf?index=trueIn PDF document text
    • http://mijugavagi.epizy.com/electrolysis_of_water_class_10.pdfIn PDF document text
    • http://sovizaz.epizy.com/79652850702.pdfIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_4b1e09f6bfbe4a9eb3969d859c7cda96.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_efbd408a26d64af69d570f2beeeff072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e74e4ac-c8d2-4f8f-b89a-3411e6e51df9/at_lp120xusb_sv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47ad742-6cb4-456d-85b0-dc09a5b8df2f/hornblower_cruises_san_francisco_reviews.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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 5720 bytes
SHA-256: 6e76e95fb41d4d02f140feaca85c8cc62130221766daa27ae90e73592b367557
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 11568 bytes
SHA-256: 8ea0472135f22c4371865f3758d91d7e1af829ee5064a926b5453f26396795e8