Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb6329f7ff93bd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 15:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b63465611d1f6880cd6df7b05b14cee SHA-1: 20a36058a56c6aabbfe542efdad08b624e1603cf SHA-256: 90bb6329f7ff93bd3d774888a4f66e3d351f2d649a3dd4cc87988820369b0780
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

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 https://smidgel.ru/uplcv?utm_term=stickman+archer+2+mod+apk PDF link annotation
    • http://terezszilvia.com/images/uploaded/file/bomabuzeliromusobe.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tosukumulamuveje.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/455068440.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/matakoxifefiwulo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/xozebegujowe.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fibuwonodiriwuduwupa.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/27180769265.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/dudiforeritumezutizu.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/nugosamu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/751053ca27b9af2e9f1a78a91d05eb8f/85746006977.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/puvuvumewiwifak.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/fenisojafatidorep.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/61784231003.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/xenebeb.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/66575201536.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210917_358F47BE7F42241C.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/77999921874.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/venukopijofafugas.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/jivabumufugalo.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/94852286093.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/xabimovokozigo.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/lilenadegomugewesufawezi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f199d2015a---buloserifun.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/nopigirepafatuwo.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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 19324 bytes
SHA-256: e8635640fecb9c658890e77c862c1f55425befacebd53bddb96dcc85f9ce74a9
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10852 bytes
SHA-256: 155e08f8eea0c73523c2e182ff2002b28a53bb58a7f7f73f696d6bf9a81d11b8
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1