Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ccb0f88db33d63…

MALICIOUS

PDF

78.2 KB Created: 2021-05-12 14:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9e1637b9b73228bf170bebc763834a39 SHA-1: 83cd43bfa85069ac3baf89d1f4ae5d3e9b4e5e96 SHA-256: b8ccb0f88db33d63355fe32da9b8bf146cee9f70b536efd9e11922fa8c3bdca6
126 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The primary malicious URL, https://dafemum.ru/strik?utm_term=best+stock+to+buy+under+10+cents, is presented as a lure for investment opportunities. The PDF structure and embedded content suggest it's designed to redirect users to this malicious site, likely for phishing or malware distribution.

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://dafemum.ru/strik?utm_term=best+stock+to+buy+under+10+cents PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff66860d12ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6021aad017e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_602c6ee196d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_6026624664c33.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/d29f03b2-b279-4dd6-909b-c9c696b59f34/58138659413.pdfIn PDF document text
    • http://sumojoripira.rf.gd/prisms_and_pyramids_worksheets_grade_4.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_7517b93a4e494b0993c867935ff799f7.pdf?index=trueIn PDF document text
    • http://fusatepalu.epizy.com/blockchain_for_beginners.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_c88eb9342d7f490b89433ac42723d562.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_b83eba1815b448afbf257b53b37daba5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8951353-8ae4-4045-8f57-a377febfff45/837701130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0a3318-97f3-42d6-bd60-2044e6f3a13b/can_i_bake_brownies_in_a_bundt_pan.pdfIn PDF document text
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_08765f16344744eb93ea7809a115fb4a.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_ef9c4400769f4fedad2e613f484a0397.pdf?index=trueIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_2bf1bd0c747d4e00affc59ba96598cbf.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_5c9456961b86433ebf7c7657f9e162f9.pdf?index=trueIn PDF document text
    • http://xipijokezi.rf.gd/anselm_grn_libros.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/shutter_island_telugu_dubbed_full_movie.pdfIn PDF document text
    • http://lobaman.epizy.com/catalogo_appleton_electric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242bfd61-040d-4898-a136-810a6ed60ab8/mepij.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_c753eb3c036541f0aa37e000cc856043.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48433bf-c153-49e2-a311-e2c97fbd766c/verbal_advantage_audio_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad750760-952d-4284-a94d-6e5a98009dd8/notelakan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4704e18-8e3d-4e42-a824-3a028481339f/how_to_test_outlet_with_cen_tech_multimeter.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_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 5240 bytes
SHA-256: e2eaad61a213ddba255977477ba349cfb7921e990e6c3c29eb1c6875674d9508
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 11844 bytes
SHA-256: e3e80d5f05bbb9fd2c32b5f7b2b7f2062c8e46995bea773408185580cf93cfef