Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be88b21a5408c45…

MALICIOUS

PDF

83.3 KB Created: 2021-02-18 05:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2b1c4759e87275f02fa14df5fc7c186e SHA-1: 2a3a0ed4c900cc265951c62eff58aa085b58ffef SHA-256: 1be88b21a5408c45bc3e64939b032e6796728b641eb7e3f3d40e8ed6eae96bc6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains and redirectors, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms the presence of a link farm on disposable hosting, suggesting an effort to obscure the ultimate destination of the malicious links. The document body is heavily corrupted, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/aws?utm_term=castle+of+otranto+novel PDF link annotation
    • https://cdn.sqhk.co/vilonunufuk/dhhCigR/25613658830.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/hfwO17f/amazon_app_store_zoom_cloud_meetings.pdfIn PDF document text
    • https://cdn.sqhk.co/donuvoduvedo/ggd8wgc/shooting_games_for_ps4_gamestop.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/ighjje6/bug_s_life_ant.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/pSticzz/66129554773.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/kiaG3Bx/little_learners_child_development_center_hackensack_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/cvY54Ci/t_mobile_55_plus_plan_3_lines.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/gd4yibz/66635409226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://surewefuwiba.rf.gd/routine_eeg_guidelines.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/avast_antivirus_free_definition.pdfIn PDF document text
    • http://dixuzudes.epizy.com/egyptian_cotton_sheets_3000_thread_count.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/1_metro_cuadrado_cuantos_centimetros_cubicos_son.pdfIn PDF document text
    • http://zumemopusel.rf.gd/vesokufimozovopefi.pdfIn PDF document text
    • http://wazuvit.rf.gd/lopojuzisarakikusuziverow.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/lit_koe_no_katachi_piano_sheet.pdfIn PDF document text
    • http://baruluzibovog.epizy.com/mobogenie_for_android_free_apk.pdfIn PDF document text
    • http://nipalarinab.epizy.com/subtraction_coloring_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/standard_queen_bed_sheet_size.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_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 4724 bytes
SHA-256: 9d8fd711d053ac444fb90570dd3ecd71ee7d56ffe4e6df35a8ab5eb8801db72d
font_01_sfnt_off00011a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A87 11460 bytes
SHA-256: 32fe5fa0d25ea86e2163a99f6c6ab85a476613bcea758f57610e6c641e9b6140

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