Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92cb72528a43c99…

MALICIOUS

PDF

75.5 KB Created: 2021-02-23 23:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4efb80daacd0413fd33706ea2953971 SHA-1: eb33fb1027f1551315d7a87f96442a788c300f91 SHA-256: a92cb72528a43c99154069545029b7a881372a6fbd5b74b5e84a7d83727ad297
194 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/123?utm_term=kelly+services+careers+sign+inc'. This URL, combined with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic, suggests the document is designed to trick users into clicking a link that leads to a malicious download, possibly disguised as a password-protected archive. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • 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/123?utm_term=kelly+services+careers+sign+inc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_5fdc0a47b654a.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/jdBQcEc/usa_dating_site_application.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_6022548be3b80.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/MjemVje/freebies_validity_meaning_in_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_60192ce37609c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/resume_templates_in_word_format_free.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/tazijezuzunarowebexomo.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/82942042761.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/adverbial_clause_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/bootstrap_search_form_inline.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/vdrl_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/oxford_listening_test_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/windows_defender_security_center.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/definition_of_attenuated_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/lough_neagh_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/nekezejusovunivulupibu.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/pusidojovasurutupufo.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/30759297258.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/bupuregefifowuwufepi.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/77723346442.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 4696 bytes
SHA-256: ab156384992090bc617d0635dcb314b2589da859ed8ed4ca701185aafa2effc0
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 11260 bytes
SHA-256: 71b85a4fb313507b6c4c4bbc3e9790eb1e8290e201451ca24846eb200272b9b2
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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