Malicious PDF — malware analysis report

Static analysis result for SHA-256 4953938bccd1f0ba…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 15:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dffcd42d8e6219e1ea4ff1dc8cafa485 SHA-1: 8cb2f68cf70358dff0b4aa1a63f509e93598fd7e SHA-256: 4953938bccd1f0bac79a19224502fad3172b0b467fa1582f71b502799672cdbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=movimiento+uniforme+variado+fisica+definicion PDF link annotation
    • http://experiment.website/pacha_pachani_palle_song_download1kgc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445877/normal_604343a67e5d4.pdfIn PDF document text
    • http://luminar4-download.xyz/pezarirolziva.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/how_to_draw_anime_for_beginners_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385216/normal_5ffcb34d59310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_60014db1ba968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_60409cf304928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_60388b2e09c45.pdfIn PDF document text
    • http://apeech.ru/como_cerrar_sesion_messenger_androidif18w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_600b25dd7423b.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/62415435582.pdfIn PDF document text
    • http://nickned.me/jozamilibuvalolerariradxaie.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/cc6240eb-8afd-490a-837e-cd6dcc917e48/derecho_romano_sabino_ventura_silva_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c78451-fa94-416e-96f4-4c171a07d5c2/74110822933.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/tikofowifef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/052f9391-8fc7-44d4-af58-ae3cff87c778/what_do_you_do_at_a_red_light_go_joke.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/withdraw_offer_of_employment_template_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/rimulafudiridalepaweja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e893fe75-f212-4933-bcb0-2b601d39de59/82719724862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12663065-13e3-4cfb-acc8-ae22465e246b/15004610410.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 5200 bytes
SHA-256: 8b14ca79162c8296b023098e0d0f24722a20a615687c66fb9476c314c5cce39e
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 11908 bytes
SHA-256: 40e47c97634953088ce3111b2bc2dd0035a1c03cd40580dc5771029d745ae525

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