Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7a65dbc53f684a…

MALICIOUS

PDF

85.4 KB Created: 2021-03-23 17:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 132e17c9124b9f44b34d241c96834b5a SHA-1: 2ff3eb96d00666607f61430937172f1fda3f0103 SHA-256: cb7a65dbc53f684ae0a94c3f67eff58fa87591247d778c16b6dbee7f9ef6d6f5
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=matura+angielski+s%25C5%2582ownictwo+%25C4%2587wiczenia+pdf PDF link annotation
    • http://fajasated.mywebcommunity.org/present_past_future_tense_words_list.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/jifhjhg/netflix_account_options_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/DzAEhi7/stickman_ghost_2_gun_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/iejjIzs/38578175648.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/organelos_definicion.pdfIn PDF document text
    • https://jometuke.weebly.com/uploads/1/3/0/8/130874139/ced2a1.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/bJhcgjo/renthoop_roommate_finder_georgia.pdfIn PDF document text
    • https://solugukaxazazo.weebly.com/uploads/1/3/4/7/134748989/zofetofakugogo.pdfIn PDF document text
    • https://lotojenamiz.weebly.com/uploads/1/3/1/3/131381761/tinukudisazu.pdfIn PDF document text
    • https://rujizubag.weebly.com/uploads/1/3/0/7/130776042/cb3a23.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/strategic_management_accounting.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/dufebere.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/10668019695.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/aha_guidelines_valvular_heart_disease.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/6fe41f716641fa.pdfIn PDF document text
    • https://namevixezevir.weebly.com/uploads/1/3/0/9/130969021/xojozovuv-jemaxiw-dijuxiguterexo.pdfIn PDF document text
    • http://jaxixojuko.mypressonline.com/matrix_chain_multiplication_dynamic_programming.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcc2e60-3f0f-4e7c-85da-9bd111d974f2/whirlpool_duet_dryer_error_code_e1_f3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f72fe3c-2211-4215-9b1b-5fce839503c5/23549024906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb848cef-9215-4719-b6eb-30a5e1faa125/is_ghost_rider_movie_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96e1601-6815-4b84-8fdc-c9c824fb39e8/nuzezaja.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/calculus_book_graphical_numerical_algebraic.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5728 bytes
SHA-256: 9256f90f00292394508a8834d4da701d9ea07af82b6a60834302df328333face
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 13324 bytes
SHA-256: 496b38554da8800dea1c88533d075cc745c4bf333cd8ab2d1b8f7f13d13eb52e
font_02_sfnt_off00012e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9B 16660 bytes
SHA-256: e7fcb312749b899b31f30f2a6d27aba9aac6e91f12c279fbbfda0fa187017d03