Malicious PDF — malware analysis report

Static analysis result for SHA-256 d011def2af2d85c2…

MALICIOUS

PDF

75.8 KB Created: 2021-02-15 15:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e6c305225b3a1d79815ef47e747e026 SHA-1: 701ab5129ab683cfc238eaccdb4f1a16cadff336 SHA-256: d011def2af2d85c2a31f0b07ae2972dee32c3bb32b0e26b17598f7f36e29dd97
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search query, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/wix?keyword=adidas+track+spikes+distance In PDF document text
    • https://cdn.sqhk.co/noperizapewo/jbhajjd/horizontal_line_test_function.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/9ifiegi/monkey_king_movie_animated.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/hj8Viab/41471577965.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/tu_nada_masykpim.pdfIn PDF document text
    • http://telgrm.site/kaththi_bgm_remix_masstamilan7bjs8.pdfIn PDF document text
    • http://italdom.fun/water_ridge_faucet_manualzhne5.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/jbTjcil/stackable_jump_boxes.pdfIn PDF document text
    • http://medtechnika1.ru/pulepitunelaka7xhl3.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/jigQ2gg/hello_telugu_movie_bgm_ringtones_free_download.pdfIn PDF document text
    • http://iranomics.com/brunner_and_suddarth_13th_edition_study_guiderokwc.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/chihhvN/wagiki.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/jjvraNo/dots_a_game_about_connecting.pdfIn PDF document text
    • http://sayseedokg.com/avakin_life_hack_apk_happymod0u0t2.pdfIn PDF document text
    • http://aycotoro5.xyz/gamulackpig.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/R6avrii/xiditak.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/gjeK9ja/real_chess_app_free_download_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepiretivixu.epizy.com/83110600167.pdfIn PDF document text
    • http://wozawexopad.epizy.com/dell_latitude_7290_data_sheet.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_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 5088 bytes
SHA-256: 11459cf4c170941e519f9dd88dfd5383c96e9997bcba063668772fbc6bdca1e3
font_01_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10040 bytes
SHA-256: 2dbfde05b04ee13bb42874298709cd75600eb1e848758680b6ed9632401dcd55

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