Malicious PDF — malware analysis report

Static analysis result for SHA-256 6957dcba0350d1fb…

MALICIOUS

PDF

70.5 KB Created: 2021-04-06 07:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb5971f242420d61859b18692ecb3ee1 SHA-1: 220c1e58fc1fc5e2ef78319a1ad397320f5c2ad3 SHA-256: 6957dcba0350d1fb79f7b613d61f9fef02ea410e69b57e22d5e533e740067e71
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'jw marriott employee dress code', likely a pretext to entice clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://midufefew.ru/strik?utm_term=jw+marriott+employee+dress+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402740/normal_5ffb76af99a9a.pdfIn PDF document text
    • http://topdouche.xyz/joe_i_wanna_know_free_mp4_download9jy5y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fcf93f231806.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/tcp_ip_layers_and_their_functionsvo5ux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6010ebba89432.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/tanederefovodudojcl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_602c8d220680f.pdfIn PDF document text
    • http://madamzero.com/carnal_knowledge_and_imperial_power8ro8s.pdfIn PDF document text
    • http://meetraisins.club/73805880621tovjy.pdfIn PDF document text
    • http://feedbacrnz.space/888011885052nfeh.pdfIn PDF document text
    • http://world-wild-shop.com/how_to_pair_bunker_hill_wireless_security_camera6mjq0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_6007681c43274.pdfIn PDF document text
    • http://klossheff.xyz/como_dejar_el_alcohol_anne_m_fletchertw2c.pdfIn PDF document text
    • http://losmopaka.site/89727355637jzw6s.pdfIn PDF document text
    • http://souve.me/average_starting_salary_for_mechanical_engineer_in_ohioljui2.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/what_does_creeping_mean_in_the_yellow_wallpapernpe0z.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d442c87-d2f9-414f-aa23-1da071407614/home_comfort_wood_cook_stove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d152db2-c7bb-4432-9248-351043b970ec/where_can_i_find_navy_advancement_bibs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a034a4e-1241-465e-9e6d-b8a58d4f3d40/7779974364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb50aac-9b57-4d1f-8f30-0069f6a47d41/81105372257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9401c86-e2b7-4603-a329-2fa4fa1607a3/pitogukezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f83f7e-f4fe-4a9b-93d7-3a8ddc672e97/27771881703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea18df4c-7272-4141-a1b9-2d88358a1852/who_is_in_power_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f3c42c4-bbe1-4e88-be5b-cb106adacb9b/nordictrack_audiostrider_800_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e4105d-99a8-4876-8f17-42eb4e13e7e5/piano_adventures_level_2b_performance_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2093b1d-b315-488b-9fc1-20a99c998cc3/difference_between_oracle_and_sql_server_interview_questions.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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 5404 bytes
SHA-256: 561c4b30fe506ce23fbd2e8abc2c47ea1a6d465b48447d18e8ad53431a3f18bb
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 10424 bytes
SHA-256: 34edb63b3b9e35cacb1b099ef06cff5a56d453486a2d7d8aa372b38d3a2fe1bf