Malicious PDF — malware analysis report

Static analysis result for SHA-256 3145fdbece5363f6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 21:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4446eee6562b7e78f53085ce6bb400ef SHA-1: 160f88150d4ed428aa844f9e930350753136f322 SHA-256: 3145fdbece5363f611e3461fa76bad9d61dd602f5b359efe4822b1c6b1d863a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laser123.com/geektic/files/67057027667.pdf In PDF document text
    • http://adaviestransportltd.com/userfiles/file/puzokewetetekaxufedexaw.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/43644942355.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/97760507537.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/50671971161318ed6895a0.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/34069279154.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/46860647103.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/35362787844.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/dixurewurilevalopusupaza.pdfIn PDF document text
    • http://epicridesnepal.com/files/gekopakitifosirumete.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/pifenunid.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/86799385805.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/46097349787.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/20153011975.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/votugedikodokot.pdfIn PDF document text
    • http://sjhtractor.com/d/files/birumuju.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/88149337506.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/gojutomimifixirij.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/15760889560.pdfIn PDF document text
    • https://computerzone.pk/file/72930107088.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/bejas.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1472654767.pdfIn PDF document text
    • https://soechi.net/userfiles/file/76154861223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=soccer+game+free+download+for+androidPDF 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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 10716 bytes
SHA-256: 9ede44b4900c8bd3ecd4fe83f00fbfd8e8458cf5606b7c4fd4032ed28b1caf54
font_02_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 14848 bytes
SHA-256: 9ee1a45cf34b33675060267c5e4a8e0bd27609779e80ddedf1da378d98443725

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