Malicious PDF — malware analysis report

Static analysis result for SHA-256 727a73deb633232a…

MALICIOUS

PDF

63.9 KB Created: 2021-02-21 08:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5b9d0f0b9c7c93aa00f0f2183b14a5a0 SHA-1: dc594396e9a7849f50f4c2739ff33ff58bc0af7f SHA-256: 727a73deb633232a67f6f8098785d9e0dea70e3823b6037edb47de81abf2c4b6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://crophysi.ru/wix?keyword=chemistry+121+lab+manual+answers'. This, combined with a high ML classifier score and ClamAV detection, strongly suggests malicious intent. The embedded URLs are likely used to deliver a secondary payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wix?keyword=chemistry+121+lab+manual+answers In PDF document text
    • http://kikizuzufo.iblogger.org/rarepewo.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/Wi9gdgf/stickman_gift_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/ijejg5O/laretigikipoz.pdfIn PDF document text
    • https://cdn.sqhk.co/lojulifuvuxu/hfgdGgd/top_funny_videos_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/diexfii/troostwijk_auctions_b._v.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/jiijbjh/standard_wire_gauge_current_carrying_capacity.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/s3jjhfG/copy_color_fill_in_word_table.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/tamobalasu/levuduzifulagora.pdfIn PDF document text
    • http://xuxevimikari.rf.gd/calm_meditation_app_free.pdfIn PDF document text
    • http://bokapobutiz.rf.gd/4_factors_of_production_worksheet.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/caustic_3_full_apk_2019.pdfIn PDF document text
    • http://renedutej.rf.gd/tidovilewazajule.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/air_france_447_forensic_report.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_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 5348 bytes
SHA-256: 1e5d88275f684ca4d40d49495e8a705c6abc4ae2a039c2b8213413fa1fdcc729
font_01_sfnt_off0000d168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 9768 bytes
SHA-256: 81c0b95ebc7b2dac690598fa10310e3be6d3030407cbb3595eff4230ca49097f

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