Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4408024b209441f…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 14:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2479d3de3bddc1d9349870df5ffc553a SHA-1: ab350ba0d44c7b48728db9a8d265f425908a9d4b SHA-256: d4408024b209441f4c3ecc2f5dd52f785f6d34fd9cd30641700f0bdd3ed509be
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=heat+n+glo+pilot+won%2527t+light PDF link annotation
    • https://cdn.sqhk.co/ritasuxa/hf8uZP4/jimijimuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_602f26ab8bb4b.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/LTifgcy/skinstore_coupon_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fdd73a1c6379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_602e7f35719e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fc701cd5fa97.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/jeWzPia/gravity_falls_journal_3_pages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_60248d76ed30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fd7a9485f326.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/vDhaShf/papa_s_pizzeria_unblocked_games_76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_60397c88856fe.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/fPgchc4/puravametuvojuvinejili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_60068f34d0d62.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/ac81854e-4b24-453f-b189-f9b6106d31a0/16178324565.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_f67cf3a265154de5a741b4398be34ca8.pdf?index=trueIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_7c0c234b1ba9467c838c6853a5ded615.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_0f8349fdddae4a519127d111f98ecfce.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_066925159cca4d92b1b5588e8cd276f8.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_e78bb67accd84e0e903d68908b46edcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b431ac-77ac-4290-8f5f-acac9d3e80de/sodastream_patroon_hoeveel_liter.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_79e0852142c64963a42fe3a77a97b6c7.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_55640c27a65d4b5fbe084e19df8a4a04.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_5822c9eb1a4e424d99318ef7f1733795.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c18901-ef24-432f-9f85-99daa3b7d592/who_were_the_vikings_ks2_video.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_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 4892 bytes
SHA-256: 0d71a05fa34850a17efa027d0e74617d8e7053918f5941991b8c057ccf52296b
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 10736 bytes
SHA-256: 45c1fb577d1b81763ed22e04d95a8b94a6b669d10c895853a8c6106e7b4ff814