Malicious PDF — malware analysis report

Static analysis result for SHA-256 59643726b3c6a92f…

MALICIOUS

PDF

75.4 KB Created: 2021-03-27 21:30:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c1a3fb8971eede080afeea249bdd2bf2 SHA-1: 2069544814c36e87c165d721901b24b7337c5f08 SHA-256: 59643726b3c6a92f194ea6c6f1ff84adb01925db967e5d51a62fb05f2eb6cdab
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure, 'Android google account lock bypass', combined with the high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded URLs are likely used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/123?utm_term=android+google+account+lock+bypass PDF link annotation
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://richteam.site/47550743227wki2z.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/XjaVCEg/puzzle_levels_in_hero_wars.pdfIn PDF document text
    • http://itdomen.fun/japanese_pose_reference_booksvxhwc.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/DvnSheS/free_gems_brawl_stars_2020_deutsch.pdfIn PDF document text
    • http://whitetwo.space/jogarcatee.pdfIn PDF document text
    • http://mklhhhh.space/what_was_the_impact_of_us_involvement_in_latin_america_in_the_early_1900sv7q5t.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/iWhe0jd/66415516237.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/fopubyzfe1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_01bc4b6976fa45d7a12bf3eb82ba0a65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/xefoduminanunefaxot.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/bleeding_time_and_clotting_time_report.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/72976512169.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/52777998446.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_90d754014d5247f4b624c1a66f5a4f40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/weguj.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/joduzipawujajadabodawow.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/game_rpg_android_offline_terbaik_2017.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_b9329c8675074967aef9e0ee8f625b06.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_1e9b3a4fc8dc42139949000e2870cb3b.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_5482dc64ceeb490aa0909205a90d280c.pdf?index=trueIn 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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 5536 bytes
SHA-256: 37c0cf3839107515e3ff2ef1e91a8b3094c1903c427401e90184ed2c8f33f756
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 11308 bytes
SHA-256: cdaf6139d7fe0cb143e0c73e589f339fa1cd65b42a5250c3394da19fc40bf58b