Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ca8ee0b5941758…

MALICIOUS

PDF

80.4 KB Created: 2021-03-22 20:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 52070bc4326bcf363a67ff75145ea8ba SHA-1: c4ec9b1b241d23d05423a187f55bdf3f02e6c150 SHA-256: 76ca8ee0b5941758e9b5850d97e3e2a0765c1901c91870b14b000d0717df654f
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/wix?keyword=dead+zed+2+hacked+unblocked+at+school PDF link annotation
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/504785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6030e4164fcc2.pdfIn PDF document text
    • http://creditactive.info/boss_dd_200_midifeoto.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/fPha0ie/stickers_memes_para_whatsapp_2020.pdfIn PDF document text
    • http://alcozerox.com/poxadanuralu8prvr.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/1d0b2acefa8b.pdfIn PDF document text
    • https://rolarijigajegij.weebly.com/uploads/1/3/1/4/131438579/kuzisemevew_mesalokorazad_wuxonadawoso_gokol.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/nIwmrih/28556387068.pdfIn PDF document text
    • http://mishabelle.ru/all_creatures_great_and_small_by_ruskin_bondh96l5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445555/normal_5fdd9041c6337.pdfIn PDF document text
    • http://cafe-cok.ru/free_download_mp4_movies_online0ek0s.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/Sgh18KV/new_football_season_2020_21.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/e6b13881.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/Ljeggjd/xipazas.pdfIn PDF document text
    • https://kefepifumadig.weebly.com/uploads/1/3/1/3/131383651/janetofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_603404cd00a4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_d2bd0c3e4c21406ca3d86b4fa59715a4.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_f0ac738b311246acab73c331a9069c79.pdf?index=trueIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_dbdb94dbca844bbc95fc01d441ca45a8.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_cec03263ee18470397287a93f3f0c359.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_bf5bbb85c28d4d548ffb2ee24699aa3a.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_0e38e0eeadbc40f2977ccf0d460606d7.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_f42a3733881541ad9d02edbd3e4bc0f0.pdf?index=trueIn 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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5316 bytes
SHA-256: 9f6c35f70df674467bc9f6d94d02299bcfaee51af31601c81b878c41e5262898
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 11040 bytes
SHA-256: 9b09d8955b5c554626ca4ed7b04bb8cf84e6e297c3d8a259e25b0baa3a768a8f