Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf546888c93007f…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 21:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b4f70aa6308322e88de85879d35bcb4b SHA-1: c41e89ea410abb15f946e0cc81e9f413576208fd SHA-256: 9cf546888c93007f5313728cc5c96171f865a924b1a35acf3112f43c2eed0185
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious or phishing sites, which is a common tactic for malware distribution.

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 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://jacksth.ru/wix?keyword=az+rock+squirrel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5ffa75978c43f.pdfIn PDF document text
    • http://bonapimum.iblogger.org/zukizapanuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/mdpifRZ/relaxing_electronic_music_for_studying_concentration.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/12072221228.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/7cVgjih/tiny_bubbles_laundry_detergent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_5fd5fbb56919e.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/cYjdhiw/parkour_definition_webster_dictionary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5fcdea70e7a2c.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/b3feb2ef0102.pdfIn PDF document text
    • http://riwuveroxuwox.66ghz.com/academia_research_grammar_test_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/hgiiKgc/car_stunt_3d_game_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/hjFjeha/samonumafovenegapiges.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5ff14c429b0e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejewidokani.rf.gd/atmosfx_3dfx_form_diy.pdfIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/ccleaner_cracked_free.pdfIn PDF document text
    • http://kukuvil.epizy.com/catalog_design_template_free.pdfIn PDF document text
    • http://ziwutaje.epizy.com/nezatitita.pdfIn PDF document text
    • http://wipapirub.epizy.com/teeth_arrangement_in_complete_dentures.pdfIn PDF document text
    • http://difezazimo.rf.gd/fomologefonovuwibu.pdfIn PDF document text
    • http://joriboka.epizy.com/risovilakakobokon.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 4812 bytes
SHA-256: 892ad59567561350c719d36b0ab35591f6faf8a702dccce7f76ed9933f41f915
font_01_sfnt_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 10576 bytes
SHA-256: 3dad17f19851977fa1772a7c0af5540917673e02bd49e1935b1803d55f74df28

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