Malicious PDF — malware analysis report

Static analysis result for SHA-256 143d59301ae4fa43…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 23:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 017822f1618f9b571e3c8eb1ad199984 SHA-1: 73a83af047fd906a0b92fab7de4e28efcd5e54da SHA-256: 143d59301ae4fa4356e5a7f4bffdf4ecf7bc73b18b60bb52a3d75db8e08eecfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the ML detection strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=how+to+disable+app+notifications+android PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131091c5f21c---19722856354.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/buben.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/46395012674.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210901225001_y7by18.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/ninotumidi.pdfIn PDF document text
    • https://escritacontabilidade.net/fotos/news/file/jigazubifojamuzesakazed.pdfIn PDF document text
    • http://abpaluso.com/upload/file/taxebinemajigopilefomapo.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/bikaronevozijowejekomini.pdfIn PDF document text
    • http://pi-consulting.ch/download/bevatisekoxomapa.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/firudaxobowefaputukakewet.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109022350533335018pds49.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/31276142691.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/vuwirusarifusidun.pdfIn PDF document text
    • http://effektfilm.de/files/file/lajuwafesepur.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/detirizanoxemajo.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/26079010857.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/41674683986.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/15894105678.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0bbee7e3---41113515566.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/nitirexejatasivix.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dekusaladawobofub.pdfIn PDF document text
    • http://matras-devison.com/upload/file/puwixiguvasezukopede.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/30369348963.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/30732726751.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 17088 bytes
SHA-256: 62a1491b1713fa164f12c97e3a7984074059d4c900adb034153ffab1dd9ee79c
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 10832 bytes
SHA-256: bce9c3880984685bed11053e843e409f15d0588358c58c05547722a36e2ffbc4
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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