Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d71b4cd6b611bc6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 19:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f76745ddc9a368dd5b60c8bde74b9ef SHA-1: 7227de591a97ad7cf5b9ee495c37930b126d4a80 SHA-256: 9d71b4cd6b611bc6a431873e51ff8e55e2494b8100d0af7b27836fab59f26d8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving user redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=play+free+games+online+without+downloading PDF link annotation
    • http://lpxs168.com/filespath/files/20210918145938.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/subikemoj.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/48190835882.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/rusagipudijujusamozu.pdfIn PDF document text
    • http://evola.it/userfiles/files/xulumapirigolekobopuwezib.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/12b2883b2316daa106257e7bbf791371/suzefo.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/gejuzoburoj.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/11042317401.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/5524366685.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/goviwoborodopokoduwewike.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/wenufitovepo.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/mexud.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/telugapos.pdfIn PDF document text
    • https://aromamarketing.md/img/files/neroforenuzozosi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede887f33c---moveg.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/tifezenewesefarugokutejob.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/nefilusuzikupi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lilozetumoxonojurug.pdfIn PDF document text
    • http://centromp.it/userfiles/files/51810415578.pdfIn PDF document text
    • http://rilta.net/userfiles/files/23015416974.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/nosivefapupez.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/tovopimufuwuz.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 17940 bytes
SHA-256: ae1cb889c72b77c8e38dab652e20281849d97b1c95db7203404c56c774108577
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 11104 bytes
SHA-256: dc88299048afb3614de2efadf485b10d4e7045739fe76f1f3927027a8f628a68
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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