Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd9e6da83936b7f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 18:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7552f6278459e752d150b9a28e235d63 SHA-1: 4b5dccb13d28f3b1e0793b9227fdddc2d39cafbf SHA-256: 1cd9e6da83936b7fae1b7d81e652ad84b4da11c2332c86464a4ca0794438154a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=wifi+transfer+android+to+mac PDF link annotation
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/35285084864.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/sozikebademipalutuviker.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/mijonaniweziga.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a176808c3---suxebeket.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/63952939135.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/41550270368.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/2109061723094912865nsppusuc3hi.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26618009516.pdfIn PDF document text
    • https://0900107678.com/upload/file/fuzunimivemu.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/25587601145.pdfIn PDF document text
    • http://newmob.it/userfiles/files/legoro.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/bumafekuxajaze.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/fodep.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/73fd572791fa67b0476f389173a7f317/84863390630.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/41841345583.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/35283071259.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/duzol.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vebot.pdfIn PDF document text
    • https://redac.ch/upload/34679296087.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/87998608323.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210902183231.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/44476303424.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/garegizusarinifakikotego.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fugizaxomarovibarebowaxu.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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 10584 bytes
SHA-256: 97153c4565057eb459c03326af56cfdc6802d710859c9aa1bf998f81d48d5f82
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 17392 bytes
SHA-256: 45396e897848fdca74f915627a20f1fbd6eca2a2d0d8af89fa8c0a3d3622cd16