Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83b74591aab7601…

MALICIOUS

PDF

73.1 KB Created: 2021-04-06 20:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8256a0dfcbcf7afa0dcfed562617eaac SHA-1: 0d6edf619195af45d47dc97b50accc0a64d2a11c SHA-256: d83b74591aab760107c57bc94fadfe7f47dd9263af258769e372f71fd8488558
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains an embedded external URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host malicious content or phishing pages. The document body is heavily obfuscated, but the presence of external URIs and the high risk score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=bootstrap+4+navbar+center+form PDF link annotation
    • https://cdn.sqhk.co/xopigotax/ghephhZ/king_kong_heroes_wiki.pdfIn PDF document text
    • http://nonretloli.site/etfe_front_sheetgn5ya.pdfIn PDF document text
    • https://cdn.sqhk.co/puranajav/gdijhiX/wokoseji.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/idjhQgd/archery_shooting_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/wlgdJjh/fm_2019_best_young_midfielders.pdfIn PDF document text
    • https://cdn.sqhk.co/fifenije/igmhZff/ratorutovakub.pdfIn PDF document text
    • http://kukushka.space/74107143052xgbnj.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/gisgggg/mera_bhola_hai_bhandari_song_free.pdfIn PDF document text
    • http://pressit.fun/brother_dsmobile_920dw_installation16fah.pdfIn PDF document text
    • http://revershjtb.site/cal_mediconnect_enrollment_formz58a1.pdfIn PDF document text
    • http://habercigo.com/the_essential_rumi_epub_vkowr7b.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/igddNgg/pear_launcher_pro_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/q3bihgW/62196756418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e836ac45-801d-4c27-b580-e77ddcb669ef/how_do_you_measure_the_interior_angle_of_a_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6da4422-ff6d-4451-947b-8612ff583a25/24682515401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e465892b-9378-4c8c-a561-9ad282a3e49a/1811582352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c3932f-cad3-460e-b950-506657012158/genie_pro_88_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e55c3a1-56d0-4697-8084-f4f4ff3b5ccc/83136862020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac697be-0864-45c0-b49d-4c8ed5b570bc/top_baby_names_2020_australia_mccrindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5adb0f7-2943-4959-86b0-41f9bdfcc101/neato_d5_vs_d7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2823de97-2c19-4df5-9053-63b8532baa2e/wahoo_heart_rate_monitor_ddp_yoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecd9354-d62c-4223-ae59-fb07a177fe44/what_is_management_in_business_studies_class_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b5414b-cad4-4b9c-b302-1f85fbf4c8b7/73753888188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dcff90-914a-4987-8689-5915bc691936/preguntas_y_respuestas_del_capitulo_3_del_caballero_dela_armadura_oxidada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97df3de2-0e0c-4645-9e02-873bcfc18679/riduragibe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 5204 bytes
SHA-256: e1d5a521c211206d4df4a7135f2ce99c852dbca25f085aa995ed570c95e4232c
font_01_sfnt_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 10164 bytes
SHA-256: e4ccb0d69f6fee35e5049df31f2d9b8597cedc6884be528134340faeee6daf13
font_02_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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