Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a85df97e51a772…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 19:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c6e887e0b82b4c1e64080161b1a7a39a SHA-1: e98bf257d9b231a031f10595c21272b7ac26c26e SHA-256: 97a85df97e51a7726c4f65d09c502e2dae6ae8bffbb89deb195448351ada7427
124 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is designed to lure users to potentially harmful content. The embedded link uses a 'utm_term' parameter that mimics a search query, likely to appear legitimate. While no scripts were extracted, the PDF structure and the presence of malicious links strongly suggest an attempt to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+the+release+date+for+star+trek+discovery+season+3 In PDF document text
    • http://tarageleg.iblogger.org/75312705763.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/maths_text_book_8th_class_cbse.pdfIn PDF document text
    • http://suvexavez.iblogger.org/cpr_guideline_2020.pdfIn PDF document text
    • http://loberas.22web.org/44225775689.pdfIn PDF document text
    • http://gabixumupa.22web.org/applied_nonsingular_astrodynamics.pdfIn PDF document text
    • http://nomuvafemokin.iblogger.org/67282353570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a69f023-18c7-4407-bec9-16eece107e12/zefaxewiwugujurajorove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a9e3ef-509b-4945-b9ce-9ab922b8b4b6/carvel_ice_cream_cake_carbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ac20f0-4d96-46c8-a8d0-0cf2f6b7bb6e/14833757206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41619d0-bd21-457f-b856-afaa69ef734f/how_to_wear_ergobaby_omni_360_mesh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243c2ae5-aaf5-415a-85a7-cf0cc6593ee6/harry_potter_and_half_blood_prince_game_pc_download.pdfIn PDF document text
    • http://zowomazo.epizy.com/galcon_9001_d-_c_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1eb714-6025-43a7-81c0-e5cb540592fe/momizageb.pdfIn PDF document text
    • http://lidezitenojugit.epizy.com/which_major_is_better_biology_or_biochemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f21890-d507-46e0-ac51-1ddc55599afe/i_hunt_killers_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464b96cf-1c15-42b4-8106-1abfe9e4d2c6/brown_v_board_of_education_of_topeka_court_decision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507955ab-3a1d-4982-b738-87d4ceade10b/how_to_learn_french_vocabulary_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67b30b9-bb39-4e71-bfeb-0ab8eaf6bd95/96787701337.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 5512 bytes
SHA-256: 97d601a3a28f6a8c121c4911ca663de1b3216df022959aac701936f56fbbf23f
font_01_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 11016 bytes
SHA-256: 932bc43b5f93b29433723c753b3f85f9e84052c12eb7e6502ea51eb2bb01ea01

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