Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52f1f7836caf1bc…

MALICIOUS

PDF

71.0 KB Created: 2021-02-24 05:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1316216e2d348d5b213fa58ac59d94ca SHA-1: 52a50259c9b6f921e5d141034a69253a6d27c1be SHA-256: e52f1f7836caf1bcf5a281569263658a8856b028559d554e5b773e94b990b39d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/strik?utm_term=what+is+the+fifth+step+of+aa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fcbf82d49e2b.pdfIn PDF document text
    • http://pitetivedu.iblogger.org/league_of_legends_runes_guide_ezreal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_5ff45f5fa8d59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fffee373cf17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_600efe260af3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477878/normal_5fe010ed7c287.pdfIn PDF document text
    • http://vifijes.22web.org/offline_dictionary_free_for_android_mobile.pdfIn PDF document text
    • http://gowitobo.iblogger.org/78791981804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fcbf40b75714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5fe84314915a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwalolerede.epizy.com/android_studio_alternative.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/sokosapalikosebovipize.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/chemistry_periodic_table_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/cbr_cbz_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/android_10_for_mi_a2_xda.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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 4872 bytes
SHA-256: 951246777e002f0d49780a418a071ef50e0f6223e4e668fc6150a6f5526f35b6
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 9628 bytes
SHA-256: 93adbc130b3b69069436c2ac310b6e5e615af93aee8c425bc9f3b46ea5bc0417

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