Malicious PDF — malware analysis report

Static analysis result for SHA-256 179082992d159992…

MALICIOUS

PDF

93.9 KB Created: 2021-02-22 11:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 98575fa3143fe691ad0518d60780fc38 SHA-1: 38816063b5bd6c1367e58469455a4d899c2cd47d SHA-256: 179082992d1599926bb17eef206acae36d73dc89af6e1a58866e1c4bdea174c0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=10+verbos+irregulares+conjugados+en+espa%25C3%25B1ol`. ClamAV also detected it as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0`. The ML classifier strongly flagged this PDF as malicious. The document body, though partially garbled, appears to be related to Spanish irregular verbs, potentially a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=10+verbos+irregulares+conjugados+en+espa%25C3%25B1ol In PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5ff6d308d0c59.pdfIn PDF document text
    • https://cdn.sqhk.co/solumapidema/RQeyicT/dalepuvefofuxenepin.pdfIn PDF document text
    • http://zugunef.22web.org/greystones_food_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_6029a23c4f155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5fcab012a45e3.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/6ahakjb/brawl_stars_boss_battle_insane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_601251657443a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_602a8647edb86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5fdf862cdb323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_6021e8268690f.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/OgeKHie/8639069234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183ea470808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505125/normal_5ffa252a9af33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_601b363736d7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadinox.epizy.com/54238647113.pdfIn PDF document text
    • http://pejigevug.rf.gd/short_story_file.pdfIn PDF document text
    • http://migumirokive.epizy.com/chiari_malformation_radiology_ppt.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_off00012b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 5828 bytes
SHA-256: 016d6b6a40106962201ff1c2d517d1c15c7122033f14419e0ad2390fee0f4eb7
font_01_sfnt_off00013f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 12912 bytes
SHA-256: 0bfb120438db72dc71b81f92cbcc45a509216127490236b3930bd70a92625979

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