Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5cadc21e89efa8…

MALICIOUS

PDF

76.0 KB Created: 2021-06-12 13:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67113d3098c45a3f993b633d745d5d93 SHA-1: 15cfa592d213dff99b62b96407c98ca8c17ec231 SHA-256: ff5cadc21e89efa8e5d27ba53cd0ab569ee9f5e0e144fcc95bd327cffd5aacad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs, one of which, 'https://chcial.ru/pbw?utm_term=ubuntu+convert+html+to+pdf', is flagged as a potential phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely used for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=ubuntu+convert+html+to+pdf PDF link annotation
    • https://jawubabob.weebly.com/uploads/1/3/1/0/131070379/kexukelizin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_6049f1b761699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd61d5a1c7fe.pdfIn PDF document text
    • https://sepadobifivak.weebly.com/uploads/1/3/4/6/134612103/2236078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_6057202c0e16d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_6005bf88867fc.pdfIn PDF document text
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/zaputeri-bimigowodevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_601936389a848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5fdb6635d4dda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_605bb1d379a00.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/xejosiv_namidubogog_burugegodijusan_demezasamujav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukibaso.pbworks.com/w/file/fetch/144751230/wopija.pdfIn PDF document text
    • http://xozojonurom.pbworks.com/f/91357271099.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/bunker_hill_safe_p45891_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3dcc91-7baf-42da-bccb-d099e404b409/what_is_the_strongest_dipole_dipole_force.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda82303-e3b5-4d19-9dd4-79c873111299/dilation_nation_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f39a23-6c99-4c0e-97af-456addff5d4b/42761044969.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144422658/zuma_revenge_free_download_without_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbb78d4-3ea1-4e2b-8ebe-42752d6ae97a/gezavalazemiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228fdbe1-1dfe-4bee-9540-4130006377c3/jejuwekolagefivofaf.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/holt_mcdougal_literature_grade_8_answers.pdfIn PDF document text
    • http://bezidoxumoru.pbworks.com/w/file/fetch/145026411/muwaju.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/f/minions_full_movie_watch_online_free_dailymotion.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 5200 bytes
SHA-256: 609590328e5ea78ff5d8cb07d9e48225171574a6a377e73213f96bf85b8b8989
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 10992 bytes
SHA-256: 6d6573e445f57fb3e7f9c77c3caef4cd5099aa3742e4da7e6406035fa4ec7d10