Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e231a01cab4157…

MALICIOUS

PDF

86.0 KB Created: 2021-03-05 14:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 25b6651b8173720013d83c27f7023b0a SHA-1: 77f49a15c639495dc30dcc3ddfdc0f45843f2b47 SHA-256: d9e231a01cab41571ea8030c09bdcb0532b4a33d6ed69d5c63469a19a739598c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs and the PDF structure point towards an attempt to exploit users by directing them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=virtual+chemlab+2.5+answer+key PDF link annotation
    • http://mutuvukawawe.22web.org/generalized_anxiety_disorder_treatment_guidelines.pdfIn PDF document text
    • http://natezaka.iblogger.org/tratamiento_del_asma_2017.pdfIn PDF document text
    • http://gixegiz.iblogger.org/pavupelikofepinono.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/agatha_christie_books_online_free.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/victoria_secret_pink_phone_number_customer_service.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/314804f2-a8af-4386-9b9f-d8df3c5148c2/general_physics_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f11323-7f45-4315-b327-406fe6797fa8/38480116244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abe00d6-3e29-4043-84cb-57896cd249d2/sony_str-dn850_firmware_update.pdfIn PDF document text
    • http://nalasorujuwasop.rf.gd/churrera_manual_inblan_precio.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/futag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37797b3a-0692-4472-80b8-2a6e12657a5e/how_to_be_an_aircraft_dispatcher.pdfIn PDF document text
    • http://bamasagure.epizy.com/27105367844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df06eaf-5fba-4531-a544-94513c1c1ae8/how_can_writing_help_reading_comprehension_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b601a97b-6e05-4c28-942c-3308b0364d5d/applications_of_artificial_neural-networks_for_energy_systems.pdfIn PDF document text
    • http://fepefemed.rf.gd/82993811084.pdfIn PDF document text
    • http://webenawawejoped.rf.gd/coliformes_fecais_sintomas.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_95b08aac42734c6e901e79832ae97090.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_c89f9cd7219547039218c93c2839ea9f.pdf?index=trueIn PDF document text
    • http://zapusov.atwebpages.com/91894040592.pdfIn PDF document text
    • http://josilofogi.rf.gd/17705083070.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_b4578d2444b947e39210835ec93185c8.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 4068 bytes
SHA-256: e3436a90064eac3ea158e980787e7d7275dba4368a3d49f763cd965f464a844b
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 5692 bytes
SHA-256: a574b698a6047983fa385621b389ca8cd1434ddae4b29b7bafc33d4cefa5e3b3
font_02_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 11404 bytes
SHA-256: 6001809072e5161b903bb59334d2dec9b56047fae4a7d6394a9c3c0a19db2120
font_03_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 16684 bytes
SHA-256: d2dbedc23249eed12779007d0c58b566766b7d8fb5b0bb1d603b2aa598fde09e

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