Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25559f8f1fffaac…

MALICIOUS

PDF

105.7 KB Created: 2021-03-24 01:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af830201f20fcc1d34f81b160c80fea SHA-1: 7f4c19a03777c9b7f609d6529ad874ee1bfbdc80 SHA-256: b25559f8f1fffaac79c50af6b028b820710057531492ff0201f0fbb47be718b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or redirection scheme. The presence of external URIs and a PDF link farm heuristic indicates an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=does+water+cooling+make+noise
    • http://conicppjry.bid/7667346146083jui.pdf
    • https://cdn.sqhk.co/mexovaru/gggdghZ/picture_slideshow_with_music_app_for_instagram.pdf
    • http://bloodcraft.online/how_to_pronounce_navajo_dineiveb2.pdf
    • http://zdorovie-vashe-vse.xyz/tableau_training_material_pptlfugi.pdf
    • http://fastgetme.online/48575588144ykw8k.pdf
    • https://cdn.sqhk.co/kadeposamo/hihhjaM/free_happy_birthday_cake_topper_printable.pdf
    • https://cdn.sqhk.co/satofapo/hagfmgf/go_viral_definition_slang.pdf
    • http://7gusevshop.website/asymptomatic_carotid_artery_stenosis_guidelinesmoe8j.pdf
    • https://cdn.sqhk.co/fagaxirupunu/ic1idjb/happy_glass_game_free.pdf
    • https://cdn.sqhk.co/bapisolel/Vhgjfjd/can_you_escape_horror_castle_2_walkthrough.pdf
    • http://groshyk.site/96707937062k5x4a.pdf
    • https://cdn.sqhk.co/zixagiko/cYuhjYH/98375897368.pdf
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mozirolinitaje/android_studio_button_text_color.pdf
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_0e1002a727a745ebb9ee4296c620ee7f.pdf?index=true
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_f577b96b87794cfd9ede795d503848fc.pdf?index=true
    • https://s3.amazonaws.com/regufojalojaza/99185511484.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/zezinib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f49.bin
63080251078dd6fcdb91b1a96296671cc05366adccfbc887f6272646fc618f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F49 5272 bytes
font_01_sfnt_off0001713c.bin
40f8a6633167b9d8dd30491992180690f3be87646db25da8a7a5f7d423233f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1713C 12212 bytes

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