Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d4f376a7bb77af…

MALICIOUS

PDF

74.8 KB Created: 2021-04-06 00:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 34d7c97b435fdab205574862e75e49e3 SHA-1: 4af456ffd9149bee1ade20167d5c366167cfc613 SHA-256: 92d4f376a7bb77afa5f9fec5c78501e961d5c0fd045b0f8f83fa56e880c894ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/award?keyword=biomass+energy+generation+pdf PDF link annotation
    • http://josobagilila.iblogger.org/85556378756.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/nusakodunugim.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/c6558ae7ed.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ziegeyP/36792402528.pdfIn PDF document text
    • http://xesorelepepidi.22web.org/oracle_sql_tutorial_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/hbUVMif/photos_tv_cast.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/30779152502.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/wakejulumabebakex.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/c6de8a08b.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/jhhriaa/download_az_screen_recorder_pro_no_root.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/fhg0Ugj/rofojudewujodofutesoranu.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/rajamegozizaguteki.pdfIn PDF document text
    • https://vujirazezada.weebly.com/uploads/1/3/2/6/132681664/vegafujukemewopapexi.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/qgejgje/best_caption_for_cover_photo_fb.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/gAFjgj8/pimabumimevibaxevebidavag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pemeromerap.rf.gd/editable_certificate_of_appreciation.pdfIn PDF document text
    • http://numojas.epizy.com/80612780465.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/articles_worksheets_for_grade_5.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/sabupob.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/jokapo.pdfIn PDF document text
    • http://ditorodizo.epizy.com/jest_coverage_report_uncovered_lines.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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 5480 bytes
SHA-256: cf0b71ba0087ef0ac7898ab3bc53cdd443145dad5874fc6e62ea4da5b130b8f7
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 10872 bytes
SHA-256: c0e10ad3e725bca8b6d751bf1d6092b3c65e85bac36029b8ddd11651e55e4ed5

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