Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f85bd08f4558d79…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 09:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3297e954bfed24f1e9ed1e95c3f3f2d3 SHA-1: 5dba2539a367de77bbbb171e62aff44f8016da1d SHA-256: 9f85bd08f4558d79e01c811440f1c369b8f121ea4409f695e3bf6f53f371a656
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gorisum.net/fckeditor/upload_file/file/raxufamifonipa.pdf In PDF document text
    • http://hongsung114.com/files/fckeditor/file/dabupazogadazojoladinef.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dovujimijafirivunikuban.pdfIn PDF document text
    • http://fteq.ru/files/file/81600741392.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/wugot.pdfIn PDF document text
    • https://kultmotor.hu/images/files/54749601948.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/dizeximeluxowafezezugatus.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/zeburime.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/93654507102.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/30762152890.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/mudukukezaxu.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/9260635992.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/9990560943.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/61898378162.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/98096187661.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/gisejokimavik.pdfIn PDF document text
    • https://rais.bg/uploads/file/sogenojotunegizivixotil.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lanuwa.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/77155629615.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/26919330690.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/kuzitipiwavelodegadobe.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/susurebalexinugag.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fitob.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/bipupo.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/5820000830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gemini+pda+debianPDF 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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 18648 bytes
SHA-256: 5964cc39f1872f101b22b3dd9638ae81a447c0b26929f019953d0eab6e2b3a2d
font_01_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 10200 bytes
SHA-256: c9f3becf9e6d8cb7cdc3206c29bfb2cdbb83ff6cc358463be5f6eb922f6cab31