Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d77d0366c9464ac…

MALICIOUS

PDF

85.2 KB Created: 2021-05-28 20:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 85cf822715b2ef6c5a79371251e879ad SHA-1: f5358e4a95e0f5c09e0c43b052e26fa6a5388c6f SHA-256: 7d77d0366c9464aca1d2c282a45e0f3a333950921b28d065fdc85ebffa2a8964
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 of which point to disposable hosting services, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=cuadernillos+de+caligrafia+para+ni%25C3%25B1os+de+primaria+para+imprimir PDF link annotation
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/8dfc609380ab981.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/refib.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/bf494dbed9c.pdfIn PDF document text
    • https://bifawodeg.weebly.com/uploads/1/3/5/3/135348479/6bf960.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/turulifedidav_badenazag.pdfIn PDF document text
    • https://jutixabit.weebly.com/uploads/1/3/4/0/134017524/7314561.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/devusurires.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/pogetaxeniwap_dimedinuxekonu.pdfIn PDF document text
    • https://wazobusa.weebly.com/uploads/1/3/4/7/134756590/foxufasesad-zofagotikel.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/73493f83-3477-4cb2-b594-588b2da29acc/sezujufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a8081e-467e-4eed-968a-ba0a1d8a0ddc/92346351797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cd49bd-acea-44b5-bc92-8c75c0310fa9/22902733830.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc54c13-8440-4e9f-891c-cb101b627a99/bupisefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd233339-e0d2-4253-bab1-bd8c6182f632/83957251446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92dd4d1-4358-4f7b-a883-8927bf959344/2014_ford_f-350_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd5a2b6-8792-484a-b37d-3b39126d5e35/99373203279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fa4c89-8852-49f4-ae1e-9041cbbcfd6c/balitasapoxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/556a7c1e-0c96-48d5-9f19-edcd959125b4/how_hot_is_the_radiative_zone_of_the_sun_in_fahrenheit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64faf293-b539-4188-a958-2d32e0250810/fumoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c15769e-249a-411d-a657-a15e2964844e/namawujika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c928a061-a419-46bd-a8b0-3732b1ee9222/mefanobidozinusasomupef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a0a0cc-0590-4cb9-9c57-0fce11e56486/jamoras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4c93e7-a056-4753-aefc-bb706baf1ded/casio_g-shock_dw9052-1b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf81191-2776-4199-9ccb-a9c09f373315/69232983567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddfb8c0-54a0-4e85-8298-63e27c1f9e8d/sinivitomenewogujakalo.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_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 5592 bytes
SHA-256: 674a315c424ec00f8971d42090a2e419aa9d984172827989e850c34b71bd7ff8
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 12468 bytes
SHA-256: 7deb916b73d56e02956fba4e3867783281e7047644ac283e799208a9f0ff6e10

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