Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a118bcabf0f3a9…

MALICIOUS

PDF

76.4 KB Created: 2021-03-25 16:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98795b24af27927045d2887a3bc76fa3 SHA-1: 61c6a049ce6cea3e6ebc46a03c97b2f5a2da4687 SHA-256: b1a118bcabf0f3a93a5fde4a5b3a360b80e45cf9a94fe976dee63373de614cf2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to SEO-optimized content farms, suggesting a phishing or malicious redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to potentially harmful URLs.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=montagues+and+capulets+pronunciation
    • https://cdn.sqhk.co/widagawinud/ijhWhdJ/pneumococcal_vaccine_guidelines_uspstf.pdf
    • https://cdn.sqhk.co/mokevesin/hgcsogh/30046076885.pdf
    • http://pitushok.space/33787558282fxo8n.pdf
    • http://halfraire.xyz/afsana_khan_rising_star_performance4xrw4.pdf
    • https://cdn.sqhk.co/fovomesit/ibtqOy1/raft_survival_ocean_nomad_simulator_pc.pdf
    • https://cdn.sqhk.co/guxuboru/Zhf9nz7/infinite_growth_game_hack.pdf
    • https://telewebejuta.weebly.com/uploads/1/3/1/6/131607630/4763111.pdf
    • https://cdn.sqhk.co/zenekukera/dcxyhia/application_show_guide.pdf
    • https://ludilejufa.weebly.com/uploads/1/3/5/3/135347725/5161793.pdf
    • http://reduslim-italiaufficiale.site/government_securities_market6ld0e.pdf
    • http://demask.space/fire_guided_light_lyricszluzy.pdf
    • https://cdn.sqhk.co/vukupamita/fOhidja/fikapikolenu.pdf
    • https://mamaganonofob.weebly.com/uploads/1/3/4/6/134602085/lomuwodarobokas.pdf
    • https://cdn.sqhk.co/banifiga/xjfjiji/24384815722.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://faxunarin.epizy.com/kalimba_sheet_music_in_c.pdf
    • https://s3.amazonaws.com/dukavunivifa/14562328727.pdf
    • http://fekamenuzexogam.epizy.com/97094164828.pdf
    • https://s3.amazonaws.com/tabobujimo/how_to_create_google_online_excel_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5d.bin
652b6e54ccff7a30575657ae34eba6976576ffca8fff5493d7b8e4f9bbbdfce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 5128 bytes
font_01_sfnt_off0000eddf.bin
026ba410d4a44cda28873e6e3c9a6857cd5a7699e5782fe3de3ced4c550d8a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 12064 bytes
font_02_sfnt_off000115eb.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 4324 bytes

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