Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20379e7a5c81482…

MALICIOUS

PDF

65.2 KB Created: 2021-03-12 21:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 581880bbb70b7939bf7014417d4e1fb2 SHA-1: 433340755b3b25b086074e2372bd653a5298de9f SHA-256: e20379e7a5c8148236a87f0111ec8c57a53d73f9c2bd78b84850ff744765d677
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically targeting a search query for 'riddle brook school website' on a suspicious domain. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

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://xezojetit.ru/wix?keyword=riddle+brook+school+website PDF link annotation
    • http://nosilekexiwot.mywebcommunity.org/janexilabekesazakom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5fd7957e12309.pdfIn PDF document text
    • http://redita.fun/long_bone_structure_worksheet_answers36fmc.pdfIn PDF document text
    • http://sollabs.xyz/beats_solo_3_or_powerbeats_proeref1.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/30138462986.pdfIn PDF document text
    • http://forezakineru.iblogger.org/lofewiba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5ff7e4485ef91.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/icWhiih/mountain_sniper_special_ops_forces.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fce23b5e7e94.pdfIn PDF document text
    • http://legiontry.online/how_to_graph_parallel_lines5rxki.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/xokutoluzolazawa.pdfIn PDF document text
    • http://vclean-sale.shop/balboa_spa_error_code_lf51ggb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeduxekuvuwexu.epizy.com/zopefozobokenu.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/77682448405.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/iko_linear_guide_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/journey_to_the_center_of_the_earth_full_movie_in_hindi_2008.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/how_to_statistically_analyse_questionnaire_data.pdfIn PDF document text
    • http://weguxuwe.epizy.com/how_long_should_you_go_into_deep_sleep.pdfIn PDF document text
    • http://bodufusuviv.epizy.com/forward_declare_template_class.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_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 5120 bytes
SHA-256: 7b0fb916894185ed32991d92ef858e7108e584f5d18d73e06d351b78dd2f7802
font_01_sfnt_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 9988 bytes
SHA-256: 65401a91fc40849f601362fb05359b63725c5e0bc27c6784f952fbcd0ef396dc

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