Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd2c61040c36793…

MALICIOUS

PDF

126.0 KB Created: 2021-02-14 16:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 73f1de78649ca59976b6c609578744de SHA-1: fd3c1bfa7bb43faafccbf65b868cb7bef55df766 SHA-256: dcd2c61040c36793cd95486b0a92ccaf5f5a140afe8ab8bdd0e36bb1ff59272a
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of urgency language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=smart+safe+app+android In PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/jaxopoli.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/dkVVMhe/zakodupisunijuf.pdfIn PDF document text
    • http://indonesia2health.online/46008836165h7vsh.pdfIn PDF document text
    • http://petersikdar.com/va_boating_test_answerson56g.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/BXhjghc/video_editor_windows_10_download.pdfIn PDF document text
    • http://gratoramaa.space/76027605901mhubq.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jhkgfKT/free_online_reading_comprehension_worksheets_for_3rd_grade.pdfIn PDF document text
    • http://ukranews.icu/ncis_la_episode_guide_season_9bkjpf.pdfIn PDF document text
    • http://front-glass.website/46510277791d1hca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doroxokile.epizy.com/arithmetic_worksheets_grade_5.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_off0001b2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B7 5256 bytes
SHA-256: e43f364fe9cabd328f10a20b263542870ec58fd18ade647346037be57a308875
font_01_sfnt_off0001c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C47A 11732 bytes
SHA-256: f73598301befdc0ab1ef4c8221cc0a68dcd4d2f779eaf64e50bc04001c1392bf

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