Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab8c901f3e71224…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 02:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b6098e38721b44f0021e6be61db8bec3 SHA-1: e4c6158bc20e4ec6edfab787b8494fe6cdfd8dcc SHA-256: aab8c901f3e71224b670d887041c68c96f9c23e284411157183c3b8c16c7762c
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=standard+ceiling+fan+catalogue+pdf PDF link annotation
    • http://zahlungsservice-ch.site/contoh_surat_permohonan_pencairan_dana_jamsostektafmk.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/briar_rabbit_y_tar_baby.pdfIn PDF document text
    • http://gelokan.sportsontheweb.net/aprendizaje_cooperativo_libro.pdfIn PDF document text
    • http://testvvd.xyz/45813334610m18qd.pdfIn PDF document text
    • http://fomilurap.iblogger.org/android_development_tools_download_for_eclipse.pdfIn PDF document text
    • http://wiinorama.website/bengali_movie_free_2018498ou.pdfIn PDF document text
    • http://indital.fun/georgia_defensive_driving_test_answers8npmo.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/a2331728-94c3-4ef5-b854-e4dffe45da62/17040295084.pdfIn PDF document text
    • http://durunorutap.epizy.com/categorical_information_data_analysis.pdfIn PDF document text
    • http://polilofu.onlinewebshop.net/xifakejaw.pdfIn PDF document text
    • http://gedemuzufo.epizy.com/85452901531.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/how_much_does_fallout_4_dlc_cost.pdfIn PDF document text
    • http://weluwekew.epizy.com/vukupelizolaporonexon.pdfIn PDF document text
    • http://wivifizurata.epizy.com/jekipubowijajiril.pdfIn PDF document text
    • http://lefukaxukukipu.rf.gd/christ_apostolic_church_doctrine.pdfIn PDF document text
    • http://zumoriko.epizy.com/bacilos_gram_positivos_y_negativos.pdfIn PDF document text
    • http://tojederetesez.epizy.com/bootstrap_4_login_and_registration_form_template.pdfIn PDF document text
    • http://sepasuguviwowuk.epizy.com/turosubudegosanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e0a4cc-273d-4e3d-b2b7-2a88f4dd3b62/elm327_mini_bluetooth_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46e31e3-7fe8-4685-a7bc-88f73d3270df/math_worksheets_for_grade_5_multiplication_and_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ae6fae-b281-4215-a6ed-731e4d1e623d/euro_pro_x_sewing_machine_deluxe_denim_and_silk.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_off0000e532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 5248 bytes
SHA-256: 4695e9007c699f5785e0d35ab70c75d575fa47434febf010528abef1fa56658e
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 10488 bytes
SHA-256: afba1abc58ba8ec05e4795ff569643fd94335aceae7205bb602c399c1ad61377

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