Malicious PDF — malware analysis report

Static analysis result for SHA-256 a380cde469bd947d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-22 23:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00c68d66fc3ed5873eb56c057cb8b51d SHA-1: c67a188dc99b7aa7062412045b2f72e63212050d SHA-256: a380cde469bd947dfd691dcd1ef7ad018017818cc8f4911e140dda25db47b34d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=vip+hack+ml PDF link annotation
    • http://asijskepotraviny.cz/files/file/88591986795.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/pubamazo.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/3573503451.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/10086919992.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56696207877.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/81509645015.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/turoze.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/95449859362.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/35599934725.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/nukalolexa.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/83702008385.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/buzajomojuruwo.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/vunogefeluwexap.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210920133533011.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/27611762595.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca55bc712---kesuwokibamovug.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/66188485556.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/wapagosikezurirunojemukix.pdfIn PDF document text
    • https://rippa.pt/files/file/33271534023.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cba31b49---28784513958.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/tobigo.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/rutatizidapid.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kukuvetujinovexefilulev.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/35735067772.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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 9976 bytes
SHA-256: 0b1ed2e58b13a4903e86bf9ef3325c21ed79d33a1c84ff1cde44ee52061b9459
font_01_sfnt_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 16292 bytes
SHA-256: 1f912239971dbe48c00d0d5923ae6e68c7041fb84f59dec71e8851a2934784c7