Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb733cf97e12de81…

MALICIOUS

PDF

91.1 KB Created: 2021-05-07 19:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7cdebcb22623b8ceb41d4aa399bd2126 SHA-1: 2524fc9faa16fcbac4bbda3b3d8813608de81acb SHA-256: cb733cf97e12de813df89ed625dc3341015dc513e3011e7da478d00b7f57c8b1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=spoken+english+classes+topics In PDF document text
    • http://sandiego-podcasts.com/what_is_the_easiest_book_in_the_bible_to_understandta6c1.pdfIn PDF document text
    • http://lg-copyright.com/vepulilemupizi2r399.pdfIn PDF document text
    • http://ledoxune.22web.org/an_american_sickness_book_review.pdfIn PDF document text
    • http://slmit.fun/just_draw_level_67_catem59z.pdfIn PDF document text
    • http://huseyincanx.com/how_do_i_install_google_play_on_amazon_fire_7bs8n9.pdfIn PDF document text
    • http://axecheat8.xyz/45852801675dz7o1.pdfIn PDF document text
    • http://artyom.guru/xujebexosinip3zc8e.pdfIn PDF document text
    • http://keripudatoxene.iblogger.org/medazugi.pdfIn PDF document text
    • http://flylovel.com/93064632611zqrqd.pdfIn PDF document text
    • http://retoxebed.22web.org/flute_choir_christmas_sheet_music_free.pdfIn PDF document text
    • http://gbo.guru/45475503045srx5d.pdfIn PDF document text
    • http://fewekikozora.22web.org/62609334526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zitaporuzi.rf.gd/sagupiboxifufax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8063ea14-5a3f-43fd-ba9b-e095205bfda9/how_to_use_pen_syringe.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/jegabuketarodetemapo.pdfIn PDF document text
    • http://gaditerigasut.rf.gd/gasabevejejafiwegafotagik.pdfIn PDF document text
    • http://zowozuzibo.epizy.com/pci_dss_attestation_of_compliance_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1713fa5b-2944-4fcb-aa79-45e42eaad0ef/wezokoz.pdfIn PDF document text
    • http://nimobavaze.epizy.com/53156635715.pdfIn PDF document text
    • http://gorevifero.epizy.com/honeysuckle_rose_lead_sheet_eb.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/13272187625.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/cub_cadet_ltx_1042_kw_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c0e967-5791-41be-9222-a7f5b288433b/wild_game_camera_that_sends_pictures_to_phone.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 6476 bytes
SHA-256: 94c320145ca2f8416457429c8e3963abd65d7ae1fc422bfef73da4ec62109792
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 5268 bytes
SHA-256: 1de62e305c7b36dcfc3d9809692583c8bd4be606aa0e3ec4ae46befdd61a4aab
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 1796 bytes
SHA-256: c9c850e9c351ce199d5e9d1c42a783cd39d33267a74ccb43d8a2fed304f07254
font_03_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 11116 bytes
SHA-256: e2f12b62d97767eee45d3769e98c6f9fd88363028da1aabc291f6d9f9a1237e1
font_04_sfnt_off00014827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14827 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0