Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81987376f699d65…

MALICIOUS

PDF

106.8 KB Created: 2021-01-28 00:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 500e7dcf4b43de738d9c7721d62a32e3 SHA-1: 4a2fb932fd6f12f8e281ebf52583c6302248352e SHA-256: a81987376f699d65ea68c7e753ba0a12194bd246c646ab50d5e70882e35f6bea
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of an external URI pointing to 'maypoin.ru' and the 'SE_URGENCY_LURE' heuristic suggest a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF format and embedded URLs are commonly used to deliver malicious content or redirect users to exploit kits.

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
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/123?utm_term=greenbrier+middle+school+chesapeake+va PDF link annotation
    • https://cdn.sqhk.co/gitopedevid/eMjerhg/tikizun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_600c70b53f112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486354/normal_5fdae5e8b749f.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/chdPlgh/35374640894.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/hcELZ34/55056170885.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/android_dream_11_pro_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_5fd1258a48878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5fed520489c50.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/dVLxidf/shark_price_old_school_runescape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_5ffc02ba142a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janenukexozi.epizy.com/appvn_apk_app_free.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/wawenulosabororajina.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/medical_admit_card_2019-_20.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_off000162a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A8 5608 bytes
SHA-256: af16aefdf9128c34e6c4472a589dd235e015b72a25767e5ea71ed7ab05f74b66
font_01_sfnt_off0001758e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1758E 12056 bytes
SHA-256: f78178503651a4c7606790ad6ac79bc8a7604eb5f3d29cd627e09b57bab323bc