Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ceb807f28616fa3…

MALICIOUS

PDF

74.3 KB Created: 2021-04-09 14:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8771fc436c56eb6659da400844e3e7d9 SHA-1: d0cd35ff521408684771191043a0738bfdffd99b SHA-256: 2ceb807f28616fa3a7079b1b834e65c168b21af63bb778d14dde030ff5b25105
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of the primary links points to a URL that appears to be part of a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=what+do+i+do+if+my+key+fob+battery+is+low
    • https://kapupidaxor.weebly.com/uploads/1/3/5/3/135386814/520407.pdf
    • http://forijezuxo.22web.org/agendas_imprimibles_2020_gratis.pdf
    • https://kiruxujekan.weebly.com/uploads/1/3/2/7/132740547/geveju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/musokejixami/46244370963.pdf
    • https://s3.amazonaws.com/tetofamuxulil/onn_bluetooth_earbuds_reset.pdf
    • https://s3.amazonaws.com/vapelurowar/learning_and_development_manual.pdf
    • https://uploads.strikinglycdn.com/files/778f0747-56f4-439b-b0e1-67dde5b70ade/whats_pre-op_before_bariatric_surgery.pdf
    • https://s3.amazonaws.com/ritoma/board_of_directors_resolution_template_word.pdf
    • https://s3.amazonaws.com/pukaridimupo/beautiful_hd_wallpapers_for_android_phones.pdf
    • https://s3.amazonaws.com/gimufesajo/cub_cadet_ltx_1050_drive_belt_size.pdf
    • https://s3.amazonaws.com/rolefosiju/ruxijakujisobujuwikumime.pdf
    • http://susupufewowe.epizy.com/ruzim.pdf
    • https://s3.amazonaws.com/dofufiri/batman_1989_theme_piano_sheet_music_free.pdf
    • https://s3.amazonaws.com/kijelopazekune/broadcast_receiver_to_check_internet_connection_android.pdf
    • https://s3.amazonaws.com/fekaduvopigab/chiari_malformation_type_2_spina_bifida.pdf
    • https://s3.amazonaws.com/jasadavebaga/71444398882.pdf
    • https://uploads.strikinglycdn.com/files/db2fd4bf-3e79-4f90-bc64-7e7396ef8659/gutisikerawuvize.pdf
    • https://s3.amazonaws.com/lebejos/jabariya_jodi_movie_songs_ringtone.pdf
    • https://uploads.strikinglycdn.com/files/edec5967-6e91-463a-aa78-5a300b2170be/how_to_become_a_software_development_manager.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e456.bin
20ca4c54e29413aaf58061bf28c1c0de27a03a94b0dd27c8c63d34caa41ee410		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 5560 bytes
font_01_sfnt_off0000f72e.bin
f78de454a3875985d778cc28596a55621ebde11a44c4036dd106a19bfb264eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 10756 bytes

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