Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9a7e58632d06e5…

MALICIOUS

PDF

76.8 KB Created: 2021-04-24 13:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 04b710e59864fa09795d1f4c061b89b6 SHA-1: 20426e06dce2e43bfe6c5587298cba9b5bcde9ec SHA-256: 8a9a7e58632d06e50e373ccbbeee337ad8bb76a8f42a4a7395b136dac8290355
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary focus on 'https://zajinet.ru/strik?utm_term=before+i+fall+book+ending'. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it as malicious. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document lure.

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://zajinet.ru/strik?utm_term=before+i+fall+book+ending PDF link annotation
    • http://renoxarogiguke.iblogger.org/analog_and_digital_data.pdfIn PDF document text
    • http://bandalet.club/730290785946nxdx.pdfIn PDF document text
    • http://thiswaytovogue.com/rerosubanibavimajwjmph.pdfIn PDF document text
    • http://slimitalia.space/54253525658jerhs.pdfIn PDF document text
    • http://wedagumo.iblogger.org/are_there_any_covid_cases_today.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/libro_de_metodologia_de_la_investigacion_2019_sampieri_3ra_edicion.pdfIn PDF document text
    • http://moreprodukti.com/download_fb_video_apkdfewi.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/9150744.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/1139415.pdfIn PDF document text
    • http://cetakchantek.com/95802558367s55a9.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/fuwawibu/consultant_status_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/best_video_cutter_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/3344829651.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/fallout_4_mods_ps4_2020.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/beginners_english_grammar.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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 5152 bytes
SHA-256: c201ff050c439f92facf789af2815ca9bb7d791c4f9a25869a9c2c46bdb939fa
font_01_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 10960 bytes
SHA-256: e2558de7fa927fa4a65f2d2edfab7db5ed2c9600b337a7bf84982a13870cab39

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