Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad36be3675b21b36…

MALICIOUS

PDF

76.4 KB Created: 2021-04-26 01:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c461c2c0d13e05b08d5ba31856c9d5ef SHA-1: a204856b072dc5e561928ed8093268091cb7bb55 SHA-256: ad36be3675b21b3696dcf5038e9c5d9c51b1c8ad0f94c627fa53474518ff8edf
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to potentially harmful sites.

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
  • 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://crophysi.ru/strik?utm_term=remington+14+electric+chainsaw+review In PDF document text
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/4784126.pdfIn PDF document text
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/0efd8817cbb.pdfIn PDF document text
    • https://nurobajaxi.weebly.com/uploads/1/3/4/5/134507542/kafanolur.pdfIn PDF document text
    • http://yourcy.com/simosevikaliwqmbo.pdfIn PDF document text
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/xewonimonele-jemexofol-fojoka.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/jgNhhpl/finding_asteroids_space_engineers.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/hdiajbO/2020_college_football_season_schedule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5fc7114da3d1d.pdfIn PDF document text
    • https://cdn.sqhk.co/zolususux/bvghjg8/nail_art_ideas_easy_step_by_step.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fe569889e773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fd8463c785df.pdfIn PDF document text
    • http://opencabinets.xyz/56023664916vzj5y.pdfIn PDF document text
    • http://megantv.site/nulevizinejujijadepem4029v.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/bvieigd/sogubokivuwofiwogomofire.pdfIn PDF document text
    • https://lekemevegov.weebly.com/uploads/1/3/1/4/131410090/43e9e883186fb.pdfIn PDF document text
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/abc757be95da.pdfIn PDF document text
    • http://autolombardpro.ru/japutafesufulataridikcq55.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/bogelirewoba.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/47274189c7de.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/1422214.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/zggknNy/block_gun_3d_ghost_ops_apk.pdfIn PDF document text
    • http://arthromedshop.xyz/kimirevabezezk0gnx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 5512 bytes
SHA-256: 3d6be1aa819732e05d4d9a687c9f7721d3d09cdfd877543150f641aa75d48801
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10864 bytes
SHA-256: 1a19470c7b9d3f0512fb16ff4f8ef8714e7b156acc380ac3d62d2a1ee1b25e4a