Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd6bc27661f2ec9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 02:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 22e8612e3e4266feb28b4e03d0fd44a9 SHA-1: ba898d18a886f42c5a564232502766342cd4a33e SHA-256: 9fd6bc27661f2ec9b0255ac6953081f6675ae04fa6ad9d2e8fcc763175130c7f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, often associated with malicious campaigns. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/award?keyword=let+it+be+piano+chords+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/xifusajexom/ihhewia/water_pollution_control_engineering.pdfIn PDF document text
    • http://getdouche.xyz/android_pie_screenshot9ikdo.pdfIn PDF document text
    • http://levantegroup.net/wireless_n_repeater_setup_passwordyr2q8.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/763272.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/fhhb9hf/xesetasorivikapo.pdfIn PDF document text
    • http://casserlabs.xyz/roman_mythology_books_fictionu7tub.pdfIn PDF document text
    • http://firstreadersclub.com/baile_urbano_pelicula_completa_en_espaol9iey9.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/762fec.pdfIn PDF document text
    • http://checkyourcredit.info/asterix_y_obelix_personajes_romanoszdrqo.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/iYSijgd/6701722131.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/jhUCieM/buildcraft_mod_1._12_2.pdfIn PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/fexasuvemamul_ripojigizovulax.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/jixerubowi/davosilivokulujokul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b49154-5cba-471a-bb31-545f25969498/boxclever_press_life_book_diary_2021.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_d4d9627c4d854660a43003c7b65c0ad7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4e2c7a-05bf-427f-a738-186044e03064/note_3_battery_price_in_nepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44cd042-889c-45cd-aad9-4a86beb9977b/garmin_oregon_450t_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/89744964729.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_1819f2734d044cedb55045e528261560.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b410e061-4179-4691-a289-0f50d791c029/cuantos_son_los_signos_de_puntuacion_y_entonacion.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/30548251895.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_4726006822b542d7924a7cf8a72b68ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73905458-ea2d-4e47-a475-d4abccbd991a/3234329711.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_off0000ecc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC1 5444 bytes
SHA-256: cc55602a734ee405c9520b42bee73ea92687a966fe8a48a8f1b10f203cebcd71
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10908 bytes
SHA-256: cf7163343fbff3f64e4e53b743973d8987b4f8618cbfe2a240f9e482869fd194