Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c19b4820c5a8f0…

MALICIOUS

PDF

74.5 KB Created: 2021-02-22 16:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 41ef71d15d20a3942d479784d45e2f92 SHA-1: f30540974ff58761e13fd6864e2dd2a3f8b3ed0d SHA-256: 46c19b4820c5a8f0317dd01070df90ce65b82d622929292ef021902357760534
224 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/strik?utm_term=linksys+wrt54g2+v1+default+username+and+password'. This indicates the document's primary purpose is to redirect users to potentially harmful websites. The presence of numerous embedded URLs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggest a phishing or credential harvesting attempt, possibly disguised as a document requiring a password for an archive. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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=linksys+wrt54g2+v1+default+username+and+password In PDF document text
    • http://1xbet-registr.site/wisotanexurodibunigvs5z.pdfIn PDF document text
    • http://berabujadew.22web.org/hikvision_camera_2mp_datasheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5ffe4485b7fdf.pdfIn PDF document text
    • http://ribupisid.22web.org/bodas_de_sangre_characters.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467003/normal_5fe0f5bc12591.pdfIn PDF document text
    • http://axecheat1.xyz/corporate_charter_approval_sheet_maryland9euws.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/mupojuwokuxoribogajuzixu.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/bollywood_new_movies_2019_filmywap.pdfIn PDF document text
    • http://lazerepil.site/chronicles_of_narnia_full_movie_480p6k2rj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fc7bcd64c7c7.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/babetafaperaxov/81236899069.pdfIn PDF document text
    • http://zepogofeto.epizy.com/filo_pastry_sheets_malaysia.pdfIn PDF document text
    • http://fezivepe.rf.gd/fimefafewixese.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/96799968352.pdfIn PDF document text
    • http://xovefepotulat.epizy.com/codecademy_python_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/49980260015.pdfIn PDF document text
    • http://zadedasex.epizy.com/john_fraser_secondary_school.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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 6016 bytes
SHA-256: c7d48d712192bf1900fac8d70a9858e994b6dda6fc0dc66641d5cc6c66099086
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10944 bytes
SHA-256: 38f83fe73ff8ae8bfb5d11c9ed6eab8424fb169f2316744f8064574958e5f371

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