Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c4eaee48e27815…

MALICIOUS

PDF

70.6 KB Created: 2021-09-21 14:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11790cb030aed8f7cf05289013ae102e SHA-1: 4f7b03af4bf751714583659ccaae9f54c1089c9d SHA-256: 80c4eaee48e27815fe2be1ecdcd8a1f388146d6e619602b3f8c67750b3ccc207
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous links to external PDF files, many hosted on suspicious domains, suggests a link farm designed to distribute further malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a malicious document used for initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ruzunafil.pdf In PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/rixasipunerilebum.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/gafewufubenow.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/16255715701.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/70996781755.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/22572681089.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/dibuvibofogeposataxojebup.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/87825262967.pdfIn PDF document text
    • https://teamcode.net/upload/files/76073301394.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/puremofi.pdfIn PDF document text
    • http://climtech.com/files/files/48945710894.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/62503459725.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/lijazojetafetusov.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f93253793f9668e6b3da9795bc9fade0/79861977603.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/90853765248.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gojadetonumero.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/94560849035.pdfIn PDF document text
    • https://anjingliar.com/contents/files/kokuvunikefawado.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/kofewojovurozara.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/25452554970.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/mizepubas.pdfIn PDF document text
    • http://usateatop.com/_upload/files/19620826494.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/14213226579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+3d+games+for+android+free+downloadPDF 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_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 15168 bytes
SHA-256: 243a03057b89e198b25d17eccba599a93b772fc2e7b7fd164ae32ee383f1dfce
font_01_sfnt_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10952 bytes
SHA-256: dfccedcf23309fe80cf09a6156136abc06a9105dcd815d69f9dde0968f2aa2ce

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