Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d033f1ac9776ef4…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 09:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3dcf7ac3b49a6fe7e5d429b11ee95799 SHA-1: dfc47abad7a095fc88d4492c3dc7280b7f30accb SHA-256: 9d033f1ac9776ef4ca8f5c4d69a2ae33a617d4439313c5ac1e6926e18bceb4fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a primary malicious URL being https://kuzutuzo.ru/wix?keyword=manish+kumar+google+scholar. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links suggests an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=manish+kumar+google+scholar PDF link annotation
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/9415006.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/69f3a3f.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/twilight_saga_full_movie_in_hindi_dubbed_downloadtsuxe.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/sureti_natelevesefeg_badabumavugo_sawidar.pdfIn PDF document text
    • http://igcopyrightforhelps.com/kujujuvuxebivuwipekoberu5jwuk.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/barisan_dan_deret_geometri.pdfIn PDF document text
    • https://kulipimeg.weebly.com/uploads/1/3/2/6/132695915/386375.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/34118091307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d8c6e730-465d-4631-886f-651770a88ec2/el_espejo_enterrado_carlos_fuentes_documental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfe53b4-55e7-477e-8443-94b04efb4f9f/how_can_doctors_tell_if_pink_eye_is_viral_or_bacterial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d8ecb8-34e3-4adb-8edd-75a197f4c8a2/how_to_make_residual_income_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e95c65-4985-4602-a7f2-88cc2d9da9eb/51053453924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d3d911-e082-4ad6-a948-f81adef8ef62/scotts_lawn_mower_replacement_wheel.pdfIn PDF document text
    • https://c482eaa1-e3aa-4fde-9473-53ba98cc9791.filesusr.com/ugd/94322e_10af375bda5f41de99db8b5e4a6e0a56.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_f263337c18a74cd3b88cdca4168cab73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24b5c7d-6b89-4f8a-8e6e-d7546234fe43/how_do_you_use_mophie_juice_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4063826-f462-4701-8e18-f22b3950cb40/giruralawekivirepo.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/adeptus_titanicus.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_82e317bb8c724a67b87c7f38173a9e97.pdf?index=trueIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/what_are_the_requirements_to_join_the_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf69919-b6af-44fa-b9fb-dce330d93b7f/how_much_does_a_pulse_oximeter_cost.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_5e08d671d225441a891436793bfd9db3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 5084 bytes
SHA-256: 4cbf3bdd563569516c6b404a6e9d795c106d470d96f666a3ae21835307d41316
font_01_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 10576 bytes
SHA-256: c446c84b279896c7ed145431760ded2df22a2a417696d805b4103f369e81f898
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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