Malicious PDF — malware analysis report

Static analysis result for SHA-256 542d342be82cc7a8…

MALICIOUS

PDF

109.3 KB Created: 2021-02-13 09:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 980de932766ebb223217e86799468399 SHA-1: 8ca6cfe9dba1d5b081ea8996584f28842091cefe SHA-256: 542d342be82cc7a87b0c27939c195e94f489a5e807da7f52b2b65c1e70dc4a1f
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to appear as a search result for educational worksheets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish credentials or deliver a secondary payload. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence of a phishing or credential harvesting attempt.

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://yafferge.ru/wix?keyword=holt+science+biology+critical+thinking+worksheets+answer+key In PDF document text
    • http://kkkirrreeee.space/nafusunifizulepelumq1dj9.pdfIn PDF document text
    • http://price-list.moscow/ts_backpage_new_jerseypv62i.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/ejfRSii/highway_truck_racing_thrill_valley.pdfIn PDF document text
    • http://vugijow.iblogger.org/update_android_auto_vw.pdfIn PDF document text
    • http://asta-stroy.ru/ccna_v6_labsaokti.pdfIn PDF document text
    • http://rumagadoli.22web.org/jifuzufaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/igrjahh/oceanhorn_2_pc_download.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/palevijuj/cocoon_travel_sheet_silk.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/english_stories_for_class_7.pdfIn PDF document text
    • http://dolasuwukino.epizy.com/xiviragaja.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/treatment_of_epilepsy_nice_guidelines.pdfIn PDF document text
    • http://lufeneweb.epizy.com/intersection_of_three_planes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/miwosupinomagedabinuf.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/18205526597.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/semelebaxavop.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/adhyatma_ramayana_telugu.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_off00016d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D20 5420 bytes
SHA-256: e08c56b39e9d8cd216afc02871b0c8a65be21ef3429cb99cf96e6d7d50ca57ab
font_01_sfnt_off00017f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F9E 12296 bytes
SHA-256: ad3e24f2ec8ebdbf3c21679f0a8a42dfe915153faeaf3d5210827ef17e0e3004

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