Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31173234519f1d8…

MALICIOUS

PDF

69.6 KB Created: 2021-03-05 02:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 65435c1a07c298330116288ecf29d86f SHA-1: 2e119f716719432dab3d9bd4ebc9e0eeeb3f58b9 SHA-256: d31173234519f1d8140f91eaad89d1ce1801d139814fb112b20d8fd3bb7f02b2
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, including one that mimics a search query for 'New Yorker magazine recent cartoons online'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.NoRobot072114-9875378-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.NoRobot072114-9875378-0
  • 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://baarspo.ru/wb?keyword=new%20yorker%20magazine%20recent%20cartoons%20online PDF link annotation
    • https://cdn.sqhk.co/linotepibubi/hgqhcdi/photo_editor_software_download_for_windows_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_60106225b0d74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5ffa86934691a.pdfIn PDF document text
    • http://nokutanebufevon.iblogger.org/39980403668.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/PjJOgi1/best_free_music_download_app_for_iphone_6s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_60417b7ec6127.pdfIn PDF document text
    • http://feboxazatoran.22web.org/congenital_glaucoma_management_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/hhjaHBM/dream_daddy_joseph_date_guide.pdfIn PDF document text
    • http://sendgrid-de.com/mapunazucjc8z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_6041672263f96.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/xbZgjes/mcat_test_cost_2021.pdfIn PDF document text
    • http://instapriz24.site/70750356801i7mzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5ffd6f05b140f.pdfIn PDF document text
    • http://rerokofige.iblogger.org/how_to_learn_quranic_arabic_in_urdu.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/e2423710-1c4d-4eb6-9268-e3ad35a61c0f/does_keurig_make_a_reusable_carafe_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e578189-5337-4815-a55d-ee32290c83e0/short_story_length_for_publication.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_33445414a12e4d27a7600c81a3e816f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5bbd97-9fda-4e55-914c-215591d74d00/what_is_the_summary_of_act_1_of_macbeth.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_8470c937731648a897dde8038cec58c9.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_f0414a89562f4680883a48df31a4dedd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7edae5-dcfd-4d84-82d0-fcfca769e82b/how_much_does_it_cost_to_have_a_book_spiral_bound.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_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 5396 bytes
SHA-256: 1a4eef5e70f69b58f0b0cfd24ad3d86aeac8fbf81b416c117b9198fdbe8dff8d
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 10452 bytes
SHA-256: e5971508e6900b274cd1b53ed692dc8ad4f7118216ddab3a421cf330b97a2c09

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