Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde93a0a56746ac…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 03:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 307b7befb2007d5b01bfe692e6b0f656 SHA-1: a1f31bf8bf58a69dd4f7cad7a0e0c0361e4fa0cc SHA-256: 9bde93a0a56746ac4cc0b93b3ebfa15f1b0c5df02afbcce568510d55aeca68d5
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and the heuristic firings suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://perfecthospitals.com/FCKeditor/file/26129246359.pdf In PDF document text
    • https://kawanmto.info/contents/files/75773736130.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/ferovojotoretefoma.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/27067360985.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/meselalaxasuludinonatufo.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/gigog.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/kemebisutun.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/bunipebevuzaxisow.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/94989432680.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/86777972216.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/voregaratilomibeniluf.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021091017514373499.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf7f7acf4---pudevejazugotimev.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/ganapedodigi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/rigitugewosuvo.pdfIn PDF document text
    • https://music-group-store.com/upload/files/wevisulutadozanatogem.pdfIn PDF document text
    • http://bdn10.cz/files/file/58690087317.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/woxuranakozuzad.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/98249160629.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/31071482116.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/96656570260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=life+movie+123moviesPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16988 bytes
SHA-256: b37d6f026a05c7a7001fecf950fc577a4759bce8ea58addfb1f4ce5674d1fb69
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 10232 bytes
SHA-256: 2b27fe1e31bf4753c26a575f7735741514a90416af664a41dc6d62ff621920b2

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