Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c0ddc273db9cba…

MALICIOUS

PDF

78.2 KB Created: 2021-02-28 23:30:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ea0f503086cddc2b83e9744f7e69fc9b SHA-1: 91b4a23085c308b4e256af7d56f34cb3a0b27012 SHA-256: b1c0ddc273db9cba08bc51c096eff9fa85bd8cf84add95f79ceee9107ce25441
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

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://pelibifir.ru/strik?utm_term=what+does+the+eagle+represent+in+native+american+culture PDF link annotation
    • https://cdn.sqhk.co/relulapezele/gi3aGe5/block_puzzle_classic_para_pc.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/11466205717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459623/normal_603a7d324079c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_603b22ea1e2c8.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/fjjgjjc/carrom_board_game_download_for_keypad_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/jiDjifC/word_finder_scrabble_french.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/ehWShdt/talking_angela_hacker_in_jail.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_603bc3f631208.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/house_on_mango_street_quotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_603a4426c1f16.pdfIn PDF document text
    • http://xivitej.66ghz.com/php_spread_operator_performance.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/35772313540.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/48143806958.pdfIn PDF document text
    • https://cdn.sqhk.co/sopaluwokaja/g8ZhdN9/funar.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/jiwisigetizoxif/esc_guidelines_dual_antiplatelet_therapy.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/nims_100._c_final_exam_answers.pdfIn PDF document text
    • http://bavidatesudujig.epizy.com/togexexoturadinumabu.pdfIn PDF document text
    • http://karababeso.rf.gd/81690856238.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_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5560 bytes
SHA-256: b8b344c3b4cdc271a00847de08be8a72e883c484641a75fc035b2062ae914c2c
font_01_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10072 bytes
SHA-256: 7287fcc8668eb0c6ea6c5e6bc5da4b03b58317dbda62e2e4877a7be64086dc5d

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