Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d9a075397f6205…

MALICIOUS

PDF

84.9 KB Created: 2021-02-20 01:25:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a45ec9c50aa54dbbfb9ffb483a64ff1a SHA-1: 4a5a81341c889da4fd5bf85456f3db100ddf8073 SHA-256: 79d9a075397f6205ca670a7604b8262d1be9309756fb3cebad6e520d45e007dd
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'root explorer 5.1 1 apk download', suggesting a lure for potentially unwanted software. The embedded URLs point to disposable hosting and domains associated with link farms, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://bologen.ru/wix?keyword=root+explorer+5.1+1+apk+download PDF link annotation
    • https://cdn.sqhk.co/dagufiwus/jihlPjf/smartthings_app_samsung_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fd1370a1c047.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/hbHO6WI/sotozogirexixuw.pdfIn PDF document text
    • http://bankrot-biznes.ru/35982203501imgwv.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/cifNCjh/mini_golf_near_telluride_co.pdfIn PDF document text
    • http://ravinugamajako.iblogger.org/identifying_descriptive_language_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/ejLThf8/18903120499.pdfIn PDF document text
    • http://shimano-stradic.ru/735234370382hiht.pdfIn PDF document text
    • http://ginosolatowu.iblogger.org/sorabaweruvarifu.pdfIn PDF document text
    • http://kubifadim.iblogger.org/1328407329.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/mQ4xge6/vadesizeguwuxutubapori.pdfIn PDF document text
    • https://cdn.sqhk.co/xukerejolar/5fhcgem/55645254596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fda66890157c.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizozife/c0g5kdn/best_ps4_vr_horror_games_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/BicQ5RN/download_waves_live_wallpaper_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/hxpieib/mx_player_download_android_2._3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_601d67317be0c.pdfIn PDF document text
    • http://slmit.space/gmaps_for_windows_7kj12s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezopiwuzalobit.rf.gd/52334549876.pdfIn PDF document text
    • http://jupasugego.rf.gd/what_is_the_ugliest_place_on_earth.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011baf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BAF 23944 bytes
SHA-256: 49a333ab95389562c0a735367d2255680f77ac07f1c79f20c8878ee4e266016e
font_00_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5212 bytes
SHA-256: 5cc79d3da5c2325054e40426617cc2cdb94f290e9dcf11d219eb070dbeaa8d46
font_01_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 11316 bytes
SHA-256: 822fabcaba04c6b139a8948e623eec14055422375c8bd7311cd26545d4c22c9c

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