Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5a997f73420cae…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 20:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78197357a1f0c536376f693d1d7b9346 SHA-1: 08f83d5aad78bc3e4b4d8268b8ad8a6375680c8f SHA-256: fe5a997f73420cae32540b5f3193a55f87b4fa7585980aa5ae6d937319280f35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=writer+plus+apk PDF link annotation
    • http://energy-labels.nl/userfiles/file/2166482001.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/xurak.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109112113242225.pdfIn PDF document text
    • https://istanajp.net/contents/files/46760512557.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/48413124363.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/vipevakez.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kojakagowimelosuroloxufib.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/bugofik.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa34141c9---gimeritixifuxopegavuj.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/sororasejawilaledaduj.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73762783252.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/1227936238.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/xujiluk.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/nakugavepuxawi.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/jaxekugozuba.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/dotikizakosopewus.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a5760353---xowedawukir.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/zevibenalanebad.pdfIn PDF document text
    • https://uudanbury.life/files/file/sevasinuxomovejepexate.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36562933521.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/91070932581.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/ririgofetigupexerod.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/patudapovuwubuwebe.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/mazos.pdfIn PDF document text
    • 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_off0000b660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE77 10204 bytes
SHA-256: aa7f6d2d218f86baae4cc0f86f2b530c8d9bab23d92d0e748e7c5b9c179fadca
font_02_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 16668 bytes
SHA-256: 9334d613721c190fe73aa88902f5263c35a2f68a9b833e7e5b15318126e2c710