Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8ecfdde651bb69…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 02:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 683119a2ad1408b42b0c56f7c5b9eb09 SHA-1: 951f1e6e7ecdef07640b12b1d73ed9c13a909268 SHA-256: 3e8ecfdde651bb69cb5048576950e3c9df64b7558553b2c4e9193d880cfe18f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis revealed a high density of embedded links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content. While no scripts were extracted, the structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://fishboat.hr/files/51522854157.pdf In PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/fadiwuz.pdfIn PDF document text
    • http://flomojapan.com/upload/files/21545821277.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/dakudekojejoluwe.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/22128440892.pdfIn PDF document text
    • http://livestocktool.com/d/files/kigororakonubopojawev.pdfIn PDF document text
    • https://2winit.com/Files/files/suxilubumigititelox.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2c32075c9daeab9f652557a1f25a2574/37783562424.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109020419044009.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/en6fv6v7f3cbj91289ag8i1u03/76140387236.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/8422894357.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/gufixapivizid.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910113543.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/64987449145.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/sifuj.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/57492356262.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/45162636524.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/nadatedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wes+anderson+oviesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 18148 bytes
SHA-256: 0a4e4aacc1cb0398c03a7bf856368b8cb07346a34c12954ab77d8facad0c1efe
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10156 bytes
SHA-256: ee4e158fa40f9a3f6769bbda4aaf6c0f71e1c72975faf5b7846db30168588c67

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