Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d4507c3ce886d3…

MALICIOUS

PDF

71.7 KB Created: 2021-05-06 03:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b0efc085c173159f98f58ac105fdf19 SHA-1: 71e2a160733a975488366500217fd1e18d0636f2 SHA-256: d4d4507c3ce886d31b6056035bc7c5b68a0b7488976f190b000ae9b175beb4d4
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 0.9996

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://dugedepap.ru/strik?utm_term=my+lasko+stand+fan+stopped+working PDF link annotation
    • http://xexajume.iblogger.org/letter_of_intent_for_college_admission_template.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/Ariihje/67121651264.pdfIn PDF document text
    • http://risorabakuwurus.22web.org/how_to_get_summoning_jutsu_in_shinobi_striker.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/ggkifgi/yellowstone_season_3_episodes_wiki.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/rejigasem.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxagoxoman/zOkiajc/capitalization_practice_worksheet_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/hjhehdQ/alien_blade_runner_universe.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/kutufapek.pdfIn PDF document text
    • http://mon-cmbretagne.best/susan_salo_jump_gridsyyupy.pdfIn PDF document text
    • http://keksik24.ru/the_wonderful_wizard_of_oz_script_play1jrn9.pdfIn PDF document text
    • http://lofitner.buzz/best_pop_songs_of_the_60s_and_70smlvr9.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/planner_settimanale_2020_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/xedebafufo.pdfIn PDF document text
    • http://luzozizibaf.rf.gd/17915682565.pdfIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_29b91446ea114786b6060f3792c8519a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74eab0ff-d24a-490c-b538-fd0026586699/55432242024.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_7790bd2ecda449ce95ebe81fe1b58dcc.pdf?index=trueIn PDF document text
    • http://vogidide.epizy.com/management_discussion_and_analysis_report_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b74cd6f-20ce-4e58-ad6f-5a3dd5879e09/33678231018.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_dda98dda17aa4855ae2b3faf866179e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f425084-604d-469f-aca7-265a16f0696d/pewaposobameduzaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8dcc2d-8e1c-46e0-b665-091212565f93/the_norton_anthology_of_world_literature_3rd_edition_volume_a_b_c.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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 5472 bytes
SHA-256: 39aad2df0d24942bf2600152efcf94cb3b3e22ba4d8159437496d93d75c3fd1d
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 10556 bytes
SHA-256: 578e2e14ce9f1d76d7c2c962bc51f877e8ddecc3fbdd1065554adbe5224407fa