Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aed4da54760f5b…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 18:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 045a4be4c3c8501b69e4191761d50ba4 SHA-1: af6d8779c6071926b1393428823c29097923227f SHA-256: 18aed4da54760f5b760f84055352a5f8069220251d976f5504bd9e3eeac330d0
146 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and a direct IP address link, indicating a redirection or download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of numerous links and the high ML score point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://busangh.com/attfile/fckimg/file///2021092621024_25792744.pdf In PDF document text
    • https://triyoga-tv.ru/userfiles/file/mawoxajuve.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/6365962600.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/92076914692.pdfIn PDF document text
    • https://0900107678.com/upload/file/fuzunimivemu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/56563188184.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161323c25a8444---wadimirubogeduta.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vulud.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/zagelesegireloru.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/gebuduv.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/27945541111.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-12/4ea20b2e7fd11d7ae029cb1558cd89c7.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/ledivozuxa.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/tixezidex.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nanuv.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/54733090803.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nidupare.pdfPDF link annotation
    • https://leuphuotcamap.com/uploads/image/files/vusijuxazavijapebovafo.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/dejinalodofenaledani.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/gupogekulasazotoxewo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/riripabusipafujugud.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f9560d15---42282477840.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3fc0b58c5---19574638696.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909231202.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/62471376535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+to+epub+converter+offlinePDF 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_off0000b40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC20 15192 bytes
SHA-256: 52ce240d35cede4ac88436e118a3474b887d9582df8be31ad9dbbdb09369b6b0
font_02_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10588 bytes
SHA-256: 1e1e96a460c599bc1001a4f96ff15c45b0054e89d290abe1d895eb1c6ef5240a