Malicious PDF — malware analysis report

Static analysis result for SHA-256 533a63f2f72ea9d0…

MALICIOUS

PDF

76.3 KB Created: 2021-01-08 22:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 571c7585ce44b1c73c34daef85239474 SHA-1: 398b01d75c4328a4f1d30aa57d568ebceef7ed46 SHA-256: 533a63f2f72ea9d02c791d60457b26c73304f24904b243e6ec5fbe89af144828
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI pointing to 'traffset.ru', likely a malicious domain used to host phishing content or further malware. The document body, though heavily obfuscated, contains references to 'Global wealth report boston consulting group' and 'wkhtmltopdf', suggesting a lure to a fake report. No scripts were extracted, but the presence of external URIs and the phishing detection strongly suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=global+wealth+report+boston+consulting+group PDF link annotation
    • https://cdn.sqhk.co/bowevuva/ejavPBh/the_academy_the_first_riddle_apk_obb.pdfIn PDF document text
    • https://lumosezuto.weebly.com/uploads/1/3/4/4/134499790/87384f58a8a.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/ewhdig9/27388039351.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/kunomet.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/munoraramupaw.pdfIn PDF document text
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/9427977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fbb7d98166c7.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/fomaralunex/31128294761.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/narcissus_in_chains_read_online_vampire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b371944-9db7-4f84-ad2e-105a1f764a8d/nibezovaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7cc5a7-9d73-4910-9eae-03fad7f4b652/57301379046.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/56783737723.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5460 bytes
SHA-256: 0313e71f15575313fab4a2b6df30d2716667ec612acfd50008e5c50e24ff75ec
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 11304 bytes
SHA-256: 22f8dd7f66d2e71222fde490fb985451642e01e6e187221029b2f1821b99da02

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