Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbab532a7d457269…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 08:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: ec061d93788877d73bd090d56b162d61 SHA-1: 92e0c62f92be1e7fdab5adeacb5784f7e8a9f1f9 SHA-256: cbab532a7d45726937ff7ffd893a62cbf6848fce9bca5d6176f88397831d94d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://synerhu.ru/uplcv?utm_term=starting+out+with+java+early+objects+6th+edition+pdf PDF link annotation
    • https://samsungvrvklima.com/upload/ckfinder/files/20652284883.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wupaxidarib.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/xafinupemelapafola.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210907141723980720r1otv1rej1we.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/verunutenedimalapalun.pdfIn PDF document text
    • https://successalpha.team/upload/files/55117636418.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/wukosevika.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/raluwigiwit.pdfIn PDF document text
    • https://protum.se/file/28216156213.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/penonotapajigagedavavafon.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/41333767438.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/samosisokakozev.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11d9f395e---nizinewusevezikuno.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/35507669956.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/nuzulimo.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/79774222312.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161320be2c57e2---79086005573.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jugupopebor.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/88395925840.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109092100002623.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/89251589633.pdfIn PDF document text
    • http://wsm.hk/images/files/51149698370.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/96655373498.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/94869628321.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/68398196041.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_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 11776 bytes
SHA-256: 22af94e391732b604488e58daf206ce7227ca52aebf2450e3eb99b4a550d0726
font_02_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17240 bytes
SHA-256: d8b21d3b31ef87c6d3bcbc6b02174f2a5cbc1e325674bbdd7706f0c642bd975c

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