Malicious PDF — malware analysis report

Static analysis result for SHA-256 2635f828fb517bcb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 19:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2078f9b6ab19028b4faa593d94bfedf SHA-1: 3a3a7770930cc1f575ba9095f9d98f09e40cc13e SHA-256: 2635f828fb517bcb536e33df889718c877f3dd6729d54a13b5968a36e4fc5933
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The presence of external links suggests a phishing or credential harvesting attempt, or a lure to download further malicious content.

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://infrive.ru/uplcv?utm_term=kingdom+hearts+wallpaper+android PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161321c95dd0bf---xuxosogafonirelonuseperiw.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/48449879867.pdfIn PDF document text
    • http://synergyproperty.com/images/files/64131277517.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/37772621663.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/86968951421.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/63472380029.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210914031036_crjjwf.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/69181819428.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/wozapetelabibojiparelitiv.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xogurotefamomemow.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/vevufefewusuluwajole.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/dutefin.pdfIn PDF document text
    • https://actor-conseil.com/files/file/74877600138.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/396419695.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16143af046d093---pefoj.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/53817199909.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202196238261677.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/36952082199.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/95589215936.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/98538367878.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/64450470865.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/62884212725.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/89301511535.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/14100211645.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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 18420 bytes
SHA-256: e3ed972f537e070217e70cc1cdf40ffa6def8ee9a62f13e80a897a6635d4d929
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 10916 bytes
SHA-256: 34f804789a19e48de6c9296ccbe5e153035472c55e68b5f3beac4bbf3b371716
font_02_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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