Malicious PDF — malware analysis report

Static analysis result for SHA-256 e435fc3277fcb659…

MALICIOUS

PDF

112.7 KB Created: 2021-03-20 11:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 058b3b45a746dea32f52cd19497ac1af SHA-1: 2955e59789001f21b408ec0a40444d0bfa63a28f SHA-256: e435fc3277fcb659dc8b4d91d3408c9144bb4ce2f3896b0a78768887ea145bda
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=immersion+heater+not+working+plumber+or+electrician In PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/eb97301d3694.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/lokoxezarodir.pdfIn PDF document text
    • http://chempion.coffee/chimera_tool_downloados8l6.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/cuantos_cm_tiene_un_metro_cuadrado.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/blasting_course.pdfIn PDF document text
    • https://filudatobo.weebly.com/uploads/1/3/2/6/132681654/nalajezokunoki.pdfIn PDF document text
    • http://yellownatural.space/visto_bueno_de_seguridad_y_operacin8crxz.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/9700466.pdfIn PDF document text
    • http://biolinkus.me/dometic_dm2652_stopped_workinggfqua.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/64936528618.pdfIn PDF document text
    • http://muluwusive.22web.org/30706633446.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/a957f3b22d232e3.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/statin_intensity_chart.pdfIn PDF document text
    • http://salonhq.xyz/22672726425gjmse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_81f2e998f94643d7946753edc2f22a53.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_f2f733dc9eda4700bcbe1cf7a699920d.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_6eab416e74ab4b4b9de2efb6ee48bd45.pdf?index=trueIn PDF document text
    • http://filexumif.epizy.com/format_code_shortcut_visual_studio_mac.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_d6779cdb02de480e90b508afd1f802ee.pdf?index=trueIn PDF document text
    • http://bunakakivukutus.epizy.com/narasimha_naidu_cinema_songs.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_d6fe4abc528745c0a639794180d812a0.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_off000179e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E4 5580 bytes
SHA-256: d59af225fcac55749c59303ec8bc70d58de844fd9c43696110d5a5a0d9e63310
font_01_sfnt_off00018cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC9 11488 bytes
SHA-256: 4436aeab0b14e340d48866679f1e4e47c75fbab42299c3f49602b79d7f82ffb9