Malicious PDF — malware analysis report

Static analysis result for SHA-256 20db1916d86567e5…

MALICIOUS

PDF

83.5 KB Created: 2021-04-06 10:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37039d74b7893734990b5087f6efdec0 SHA-1: 8d35173d77401bd4949fa0dc8b5cb6022f98f76e SHA-256: 20db1916d86567e5fc722aec1ba840049ad87de285f31534c5dd8c78f6a3d0fd
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=ninja+cat+unblocked+games+at+school PDF link annotation
    • http://govikafevojonit.22web.org/78942881409.pdfIn PDF document text
    • http://kemedejovon.getenjoyment.net/xifukoregotitinenamebumaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_6020876a70c09.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/sexofatofage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_6029609186aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60372eb980ec8.pdfIn PDF document text
    • https://wasefopepaseb.weebly.com/uploads/1/3/1/8/131856398/4212744.pdfIn PDF document text
    • http://xuxizud.22web.org/eyewitness_report_of_deportation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_600a81f90d0d7.pdfIn PDF document text
    • https://jatomotubaw.weebly.com/uploads/1/3/0/7/130739460/vewexo_jisikebegus_muburukas_faxefodowuvex.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/a55fa262-b864-4945-830f-db91ff0614b7/57539925446.pdfIn PDF document text
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_b904c726cfe240308304ba6696b1d26b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25a4c92-b593-4d70-8af4-489af7d08149/what_are_the_fodmap_groups.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71268190-b6fc-4dc8-8a0f-7646d241306c/ejercicios_limites_2_bachillerato_sociales_resueltos.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_e811b2fdc3584dc88530d093dcee42e2.pdf?index=trueIn PDF document text
    • http://vudexejuvejutek.rf.gd/firebase_auth_token_android.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/centrelink_carers_payment_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9fe267-3516-4739-bace-a67fc61c8c5d/fafamosizuzaloka.pdfIn PDF document text
    • http://lamupilabixekuw.epizy.com/38944452192.pdfIn PDF document text
    • http://zexitan.rf.gd/wonumafakubemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91a747e-6b4f-4d62-99cc-da5a7123d0ae/how_big_is_a_6_quart_pressure_cooker.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_1f5c7c990b2b419da3cbb27759f7ae23.pdf?index=trueIn 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_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 5504 bytes
SHA-256: f3a006a47e3a1399bd70f197be65e27537cb54fbc28e1e4d6eec5c0ae3a8f429
font_01_sfnt_off000119d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D3 11336 bytes
SHA-256: 0e6d37f93fc5a983cd9aa3114a15acccd677fbd7a5757fec059a1a608bf54403