Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b343e66b423ebe…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 17:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 815e94b604cbdbda0114daf8b4a32ed3 SHA-1: 2c0332cf4ffdbfd6d98b23338df73a00efd95afa SHA-256: 76b343e66b423ebec412f79185e83c32e29f77a694a32b847c2912c52920d0e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=let+the+church+say+amen+marvin+winans+lyrics PDF link annotation
    • http://siamintertrade.com/file_media/file_image/file/95850294617.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/94354915295.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/65krth6ios9gfga82mh4313e7a/zagumu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/pevarimisus.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/lutebotewediwovakudogepi.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/91346895686.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/98081288472.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/siwomidawavololer.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/sotutovobamex.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9bdcc6fc---kiluwunogagamojufepalefu.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/poximenixozagorulavizefe.pdfIn PDF document text
    • http://oilspecchem.com/files/sekupoja.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lisojimirobabilak.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vonalileta.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/16551838008.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/zebogisik.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/buvukasuvape.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/10034140658.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/60436156531.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/gifofobufafojo.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/13351359787.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/99888949656.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/fadeb.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/58731394984.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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 10700 bytes
SHA-256: 5b79e221422c6a404eb164b2661acaa1820e491f7e2bb1a5fb26f62bd6cc911c
font_01_sfnt_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 17624 bytes
SHA-256: 6b3e0d70ad2da7728c8caaa8acd55dde432b2d59c7a4b31eae83f2eec03fe010
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1