Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67a759cfa97f3bc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 03:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8b04ec8dd055578a866cb5a22a299be SHA-1: 331f7145ed368e53cce65b33992f4bcd4591f309 SHA-256: b67a759cfa97f3bc72a63c18706a00cfdb0df33863106d5c149597245a11632d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=how+to+save+selected+cells+in+excel+as+pdf PDF link annotation
    • http://ranahytta.com/ckfinder/userfiles/files/sugejusaluwapus.pdfIn PDF document text
    • http://jump360.co/upload/files/20210905152135.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/zulifudaferuse.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/22606342220.pdfIn PDF document text
    • https://kaimano.it/file/tobam.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/roxosemiladukuduwu.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/matipagaxo.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sesakewivowijidez.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/14059778098.pdfIn PDF document text
    • https://tierlistei.ch/downloads/12169368150.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/levomujuzalil.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/begofapogobojos.pdfIn PDF document text
    • http://thefertilizerproductionline.com/d/files/rejuk.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613924966c573---barekiteworuvowimafodi.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/51519952968.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/revatoxaveza.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/43393139413.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/fepefimugoxatuvopu.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zajibokef.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/82825179847.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba825aeeb---zudipiwepiv.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nomepigazimapimolagor.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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 18056 bytes
SHA-256: 2af0c80f29b682bd19832f476490af20fde869680f675d896988ab66c0ea4e2f
font_01_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 10760 bytes
SHA-256: 7db1d921a842fcb707d2c3f28f5757da935ae13c088053a2fb4ed89873e31190