Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b730e531cfc0cb…

MALICIOUS

PDF

77.8 KB Created: 2021-05-14 22:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 12b1fcd0d79320bdc4aa773381cb5c2a SHA-1: 802b5a6574a174c4aabbb5e138ce17313ab92ec3 SHA-256: e3b730e531cfc0cb304440319a038440a5424e912fdd3faf5d3734cc296e1ac9
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 0.9952

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://bologen.ru/strik?utm_term=what+is+the+role+of+theory+in+social+research PDF link annotation
    • http://pixidilivutep.medianewsonline.com/samsung_bd-p1590_blu-ray_player_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/fbuX6fw/suppository_or_enema.pdfIn PDF document text
    • http://remontvorot24.com/celestial_equator_defl4ao7.pdfIn PDF document text
    • http://perevod24-card2card.site/examen_de_ingles_3_primaria8q5xt.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/86460741508.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/oftPYFz/kirby_star_allies_music.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/KRijvCS/phoenix_movie_showtimes.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/bijeGge/x-_plore_file_manager_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/ifigggn/bahubali_the_game_mod_apk_download_android_1.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/auriculoterapia_ansiedade.pdfIn PDF document text
    • http://all-casino.xyz/raketesewemukinusires2vsm.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/ghbjeig/vewirojefoket.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/bazovosesujakapiloxebi.pdfIn PDF document text
    • https://cdn.sqhk.co/puwonereb/wRgjhdG/go_test_escape_analysis.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/vopojuwibelajojudopivotuwyzex8.pdfIn PDF document text
    • http://devicesprotectionforusers.site/potato_late_blight_disease8o09m.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/tosevud/12357701283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a558d6fb-b8c4-42e9-9504-ec4fde50742f/bow_tie_medical_broadview_heights_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/autocratic_and_democratic_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3e6060-abec-4ef5-a52e-d1ba0f25d15e/48643241449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7b7cec-8bbe-4d64-b249-ea560dc4ee56/the_transition_to_college_writing_chapter_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/38467040862.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/sex_offender_registry_in_texas_by_zip_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68669cd7-23c5-42e9-8338-234aae989e18/44271980394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2110bb4-7b09-4f4d-ac61-46a0a0112f5c/miwisoxarifomajikov.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/79561649207.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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 5084 bytes
SHA-256: 3d487abd3a84640208521747d3e44253bc3e1521b63d4157c1f539c23c8cc2ff
font_01_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 10416 bytes
SHA-256: a4120002ba22593397c2905ffcff57958fa6dc941938068c620b551271762a08