Malicious PDF — malware analysis report

Static analysis result for SHA-256 dceb5b263c065617…

MALICIOUS

PDF

75.1 KB Created: 2021-02-11 01:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6b702ab969609c1c155950f7802f3bd1 SHA-1: d5a2f2cc122c1ca166c575d3a9210f0b2a8b9cd1 SHA-256: dceb5b263c06561747c1377c1a2d67760b7ebc496c5b40870d8599642ff955d0
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of external URLs and the overall detection profile suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=fort+wayne+antenna+tv+listings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5ff20a6a9202c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_600dfcca7f6d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5fda20352dd2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5feb86286764b.pdfIn PDF document text
    • http://pro-komp-master.website/payback_ejercicios_resueltosnquo8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fe9393f10303.pdfIn PDF document text
    • http://werenntaq.online/adobe_acrobat_xi_pro_serial_number_lyv3n4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384296/normal_5fcc0c8c5bb17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fe7ade5e5a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_6019b4ecd65cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fcda106abe34.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/kexamoxusinixu/spanish_emotions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/43438188249.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/ropale.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/gizibefiwululujufuz.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/xizegu.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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 5064 bytes
SHA-256: 4a1031cb51f1ecce4937b5f5149afa26588768f8559d52d840abe417c3bd0eb1
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10624 bytes
SHA-256: 4b8677b01a5017ab6a95524e94ca3786103958e54b32a79a0804408f9df0d04d

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