Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ce437052c8a5bd…

MALICIOUS

PDF

73.6 KB Created: 2021-02-19 09:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 63bde6c19abf53fe04afe9ba4ccffee1 SHA-1: aedece8a0bdc242b17fe256387285f8f5e5d978e SHA-256: 55ce437052c8a5bd5b2a66249d41d2eccadd1fcca4aba55d63aa362a8951d16a
116 Risk Score

Malware Insights

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

The PDF file contains a URL that leads to a phishing lure, disguised as instructions for resetting a Zmodo camera. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URI point towards a phishing attack, likely delivered as a spearphishing attachment.

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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://seumenha.ru/strik?utm_term=how+to+reset+zmodo+camera+zp-ibi15-w PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417422/normal_601c6a1284dfb.pdfIn PDF document text
    • http://ses-paypal.com/terizorifimuzerie5xpa.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/icyjdDI/50777049034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496853/normal_5ff4ced124367.pdfIn PDF document text
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/793030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6024c3d012722.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/bupaxomu/botifirubigujixewe.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/twitter_app_for_android_tablet_free.pdfIn PDF document text
    • http://dudotofuzariw.rf.gd/bogavosen.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/el_alquimista_lovecraft.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_off0000e15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 5636 bytes
SHA-256: 2818dca8f95dd84f2cf79a3659f78f13e6e4ca6152e5a8542563bc2fef3bea7b
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 10892 bytes
SHA-256: 9e8e77dfb77a5c1165a600b4e118e37017bd11a93c9896e494793ca2571d6459

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