Malicious PDF — malware analysis report

Static analysis result for SHA-256 4227a9fa24f83caa…

MALICIOUS

PDF

70.3 KB Created: 2021-01-09 19:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 153a59f057721cb54cc1429bf95dea7b SHA-1: df996ed3f13d608227885e1c1a60bde76187f377 SHA-256: 4227a9fa24f83caa5fede5a9ead72bacb20f178f72117cb198dd1a1fe5b04809
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to host malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a search query for 'descargar oyasumi punpun pdf mega', suggesting a lure to download content.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=descargar+oyasumi+punpun+pdf+mega PDF link annotation
    • https://cdn.sqhk.co/wixexozesila/dhfCibS/wolf_wallpaper_for_iphone_4.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/hdhigj9/alchemist_symbols_and_meanings.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/cbeRgjb/punutajosilukux.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/nK1gfjd/share_wifi_password_not_working_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/4hfrrij/ten_million_zero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f97536b97474.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/sHhdrhe/batesilenetasubened.pdfIn PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/9232631.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/ia4hbf4/alone_season_7_winner_spoiler.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/uhejcM8/pixel_10_q_icon_pack_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/koluzigivijavu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/uc_browser_app_link.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/twist_song_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/boruto_manga_ch_36.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/silent_auction_rules_texas.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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 5544 bytes
SHA-256: 6d428e8282a36d94f38b0f76bc5dde857d7b9df0ff05ad3ebabb4e38f5586b3f
font_01_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 11228 bytes
SHA-256: 3131df4b2c1e7f494588f3f01f8496369335b958974c562c1f7078243fa8a910

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