Malicious PDF — malware analysis report

Static analysis result for SHA-256 9581c8d534f0b7cf…

MALICIOUS

PDF

83.0 KB Created: 2021-04-23 02:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 706d56d4a8cbe278c8b987e29bfc447a SHA-1: c81930566e3ff7ac2b329c07689ce744f2f27b09 SHA-256: 9581c8d534f0b7cf05b9bf57b86fa93abd9e83bc70427c0a1cb78ea3c2c5cae8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The document body, though heavily obfuscated, contains a string related to programming a liftmaster keypad, which serves as a lure to direct users to malicious sites like 'resalured.ru'. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+to+program+my+liftmaster+keypad PDF link annotation
    • http://sfhgfje5df.xyz/11961819187u1nwo.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/ghbIjbZ/tagafunogopusamilim.pdfIn PDF document text
    • http://aicberg.net/how_much_do_process_control_engineers_make6xw8k.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/kotebekurazuzisixitew.pdfIn PDF document text
    • https://cdn.sqhk.co/riduwadanu/Hzget3z/59766304291.pdfIn PDF document text
    • http://glawerry.online/selumujebavimuxuteu4aa4.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/free_attendance_sheet_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/hjznMhg/74890069423.pdfIn PDF document text
    • http://olx-delivery.cc/dlink_dir_615_admin_password_changeqq9bx.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/sejikadep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidazeze/airtel_app_apk_all_versions.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_27849f4ab82e4339b5eaa7237dad7198.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_ab7013a8954d4d0ab9487d54e5a9787c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/47041971666.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/mean_median_mode_range_outlier_definitions.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_c91e58c189f84c6884807d6fdbf88a4a.pdf?index=trueIn PDF document text
    • http://wemaxoseni.myartsonline.com/asme_bpvc_section_ix_2020.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_cf61f812266e458a8ae10543f41ba0e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/kakaostory_old_version.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_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 5580 bytes
SHA-256: cf2085b1a95db691fd0811278d58053827dfed89fc9d983ba52d4e9c9c17d467
font_01_sfnt_off00011893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11893 11372 bytes
SHA-256: ad097ec961da6b67a82c309f713b3a42171a4dd48bef1917f4c0cde3f4259976

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