Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec3ce20c4efe73a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 18:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63f196d49a69f9a5d2db058a6f514ed6 SHA-1: fb5607cde2d7bebade80fec988bd55a6b2636a6e SHA-256: 9ec3ce20c4efe73a55827422665faf3e7a9513fd3645e1ba63bbb9cc74c23610
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting it's part of a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a probable attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://milliondollardesiclub.com/upload_files/featured/files/fekopeporabewexekusibi.pdf In PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/xanupimozomowa.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109130413423267.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/17193559441.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/28838947575.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vupewuwe.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/lijemofo.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zojewamamesabofa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe141ec6b---dosopurovarelipapunubutag.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/powelojexa.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/34918840904.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/dukubakadivebosapati.pdfIn PDF document text
    • http://snft.ro/media/file/41160054349.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109050745355663.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/jiletubudotukerow.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/84156138996.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/tapusurogutupepijovekiba.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/17052103086.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/dijewuzagesivulowixekux.pdfIn PDF document text
    • https://stvorki.ru/files/file/72782629428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pubg+mobile+data+obbPDF 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_off0000c13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 10460 bytes
SHA-256: 25fa6ed5c2cbf96e170485d8da9d6cbde59ac280a2b498c2642abbdbe7f43707
font_02_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 20240 bytes
SHA-256: 39eba653efd7c5008ab7bc00d6d939f6ee8bcc3051ed9426fa8cfd1c53c422cc

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