Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0b35d8cd7b6e01…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 06:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f43599cd13b2274c3dcdf76ea9e66af SHA-1: 7d7c62b12be62eaedfafd1129b74dad4479b09a9 SHA-256: 2e0b35d8cd7b6e01e457f28d34f376f7cf59f12f2a7760863831952afd42c3b5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The 'DOC BODY' content, though heavily obfuscated, appears to be metadata from wkhtmltopdf, suggesting the PDF was generated programmatically. The presence of a heuristic flagging it as a link farm and the suspicious nature of the embedded URLs indicate a likely attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 4

  • 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://bakersfield.thepokeluau.com/uploads/files/nofoxomukakeguput.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/82037810630.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/rawovisu.pdfIn PDF document text
    • http://machulski.com/public/file/diwogenepixetefatikeka.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/80380360215.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/wikixomuxanasu.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/73402800991.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/23867911832.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/pikupuzife.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/36103422848.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/26651167176.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/voxine.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kupitekolexoxo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136630a90355---28405443913.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/95347043744.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/77833277897.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/pazuluberajenof.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/ditanozijuzamirinolowo.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/busilukepitapejeva.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/kiwofetozen.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/41250798185.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/gotijofeduzusobafatukid.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/aa57b6d4b1254840ba54d9642e518df0/73895042765.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/dowimomibop.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/duzomefajefemisa.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zojotilotizimunevulejele.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/77320558431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=python+shell+for+androidPDF 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_off0000bf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF50 16096 bytes
SHA-256: 7554ae85e5433e848b8b8bc92686308460823d47ebdc6e9871907d8050558efa
font_01_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 10568 bytes
SHA-256: 9db4452ff22cdcde7cbfe23e3afa9ab8da81f60bf8956b2cf1a0f47851f8df6e