Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96900bafd001114…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b92ce4779814274afb3606b0439bf95b SHA-1: 557b33b27a88f0aabb09701562c652812a089f99 SHA-256: b96900bafd001114466d7f09053e2f68efaefe717a2c56ff511fbe5dfeed029f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially disposable domains and are structured as link farms. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deceptive purpose. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://beauty-full.ru/uploads/files/80878754157.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219111723152054.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/47164789414.pdfIn PDF document text
    • http://chongros.com/userData/board/file/jomoxokasoruxid.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/dojatokuduzidoso.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wilomezebevidafo.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/80530999679.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/51581068696.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/wesejuge.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/momumisetogetoxukizak.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/butiwotifizi.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/gukopamozapabomedu.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/14303460232.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161340a3665b83---96361698494.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/vixiwowuwerof.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8df6a9a56e2ee811b569378317d0e228/salafared.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/wojaselat.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/diliboxeketomofexuritis.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/6382482125.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/24252165568.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/68502123036.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/vugetelitu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/gimivivitoz.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903101653.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/podubolisikofadeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=resso+app+premiumPDF 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_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 10312 bytes
SHA-256: 88c0be174b8055d968448f81f7ea75e5ecc73eeda8cb5cc46e77318f709d7e99
font_01_sfnt_off0000e002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 17056 bytes
SHA-256: 89261a530ccf4e13cff9fc1f936d19a818ea2fcb94570d3abbbd8ac30f4bc5aa

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