Malicious PDF — malware analysis report

Static analysis result for SHA-256 50db330f2d6afd05…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 02:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ef93014451bc9e15896c9220908807e9 SHA-1: 56a775ff8b3cceab4f20450b8aff45823d8237c1 SHA-256: 50db330f2d6afd053648e93872b85187a33d47188fda1c22259e1d0839b8bdbe
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://botokaw.ru/strik?utm_term=cuisinart+coffee+maker+on+button+not+working PDF link annotation
    • http://vawagizipul.iblogger.org/jupotixom.pdfIn PDF document text
    • http://xitaboketeloba.iblogger.org/82060179874.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/annexure_3.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/sokinusupat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guzedero.rf.gd/items_terraria_guide.pdfIn PDF document text
    • http://gusufarafedi.epizy.com/example_of_internship_report_malaysia.pdfIn PDF document text
    • http://xujijanuzovaziv.rf.gd/13728998546.pdfIn PDF document text
    • http://mibofive.epizy.com/best_emulator_for_android_app_development.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_ee5dab4faaff4adca119ddf3e0028c92.pdf?index=trueIn PDF document text
    • http://fatapiwav.rf.gd/doing_business_in_vietnam_a_cultural_guide.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_4f8a0c1c477942bcaeac6be7a9ecc229.pdf?index=trueIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_d8069d3876d54e59bdc07c298e00b925.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_c9377fa12ee44428ac3cb536ce34562b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/13211862035.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_c42d4504623044feb011bb7ecbc74f93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/88594969800.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_7e466be7b96a4fdf9535b2d3fc5d5da1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/dd_books_5e_set.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_ac76e348937349f4b4513702bb7c316a.pdf?index=trueIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_7fff7e0574464aa18aa41fe80120694a.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b4bf57c127044476886bf6813114161e.pdf?index=trueIn PDF document text
    • http://kolavosenake.rf.gd/28922119459.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_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 5368 bytes
SHA-256: db6ade7e2be415e30807b72e3d55cbf85f10985031f404e35e09db4700bca6af
font_01_sfnt_off00010e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9D 11192 bytes
SHA-256: a44fa18bd5567e5b002bbdbfef6ad8a20d17410d98bb04704e58b8fdd4129bbf