Malicious PDF — malware analysis report

Static analysis result for SHA-256 86548d8cb080b7f7…

MALICIOUS

PDF

68.9 KB Created: 2021-09-21 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b6bfee5164e209a0e9db3c6f5a6a146 SHA-1: c13167e4e70bec57c82ff1dd2439ccc9dc338cab SHA-256: 86548d8cb080b7f78d7a2c99f39a70ba0eae0b58883c9d84429dbc6a9ceb8145
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pistant.ru/uplcv?utm_term=north+street+family+medicine PDF link annotation
    • https://chungangroup.com/uploads/files/202109072203028153.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/25118021170.pdfIn PDF document text
    • http://wawa757.com/uploads/files/53367685046.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-2/20210902205651457130.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613227194f967---53484308354.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/benigod.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/43101947893.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/jideguzibeb.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/79984661616.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/rugofasepezinibesov.pdfIn PDF document text
    • http://ippon.lv/uploads/File/fefipu.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/75222564368.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109020655512218.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210918213755.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/puvewavo.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/jaligabaf.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/tokurekokizuj.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/32774853897.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/ranorawowosujufadamuxek.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/kifekudenajijijimibogex.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/16379066351.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_off0000b01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01D 14876 bytes
SHA-256: 5eb0019eccc1b8a95d9fba04a54f0a94cbda4c10beddcd98f8127042dda09341
font_01_sfnt_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 10832 bytes
SHA-256: 0b654eefd91053ea7bbcee7015b68a629661758d934a6e7011e4469e7c64a1c9

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