Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41b5958683a53ce…

MALICIOUS

PDF

88.8 KB Created: 2021-03-05 02:20:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 699e4dea50b8c51efb85d060d3d677c8 SHA-1: e85adcfb960db7a36addf45904555646fd07fe0f SHA-256: c41b5958683a53ce8007aba94f368885966ec7da1a0b874558eb882c95ab3018
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or spam campaign. One prominent URL, 'https://kuzutuzo.ru/strik?utm_term=pastor+paul+enenche+wedding+anniversary', is presented as a search result, attempting to lure the user. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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/strik?utm_term=pastor+paul+enenche+wedding+anniversary PDF link annotation
    • http://kogutojoveso.mywebcommunity.org/dark_disciple_arc.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/yduggg9/reversion_definition_in_psychology.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/kobalt_10_inch_dual_bevel_sliding_miter_saw_review.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/33178735308.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/48442777782.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jX2psFs/wilinipizonugimex.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/carson_dellosa_spanish_middle_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/aZ9rUgj/tropico_5_walkthrough_ign.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/cuisinart_dcc_3000_12-cup_on-demand.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/56954712674.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/witiroku.pdfIn PDF document text
    • http://xolokukifimiv.sportsontheweb.net/82026139062.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/r4xicIG/earthquake_california_warning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rabovawixi.rf.gd/3999099349.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/dimagojazilefuku.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/rainbow_magic_book_series.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/xapevumaxufarapijenalame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fb2c6b-6f94-48b3-a474-4bcc70686d4e/28689354992.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/how_to_link_garmin_echomap_plus_93sv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdf0e6d9-49f7-4622-9c66-59e58c46e6d6/why_is_the_us_light_orange_on_my_arris_modem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f84dc51-f08f-4378-8dc1-95fea05e1d3a/9751770757.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/the_casino_job_full_movie_hd.pdfIn PDF document text
    • http://tititogejeda.rf.gd/xaguvefelumumojatifo.pdfIn PDF document text
    • http://jilawovo.epizy.com/ponul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82e2b10-8fd8-49b8-923a-4b1eac8398d9/vuserenobomideba.pdfIn PDF document text
    • http://zotijoxamofos.epizy.com/nivakijajuzeretuwanitede.pdfIn PDF document text
    • http://remokulepene.rf.gd/what_does_a_missile_technician_do_in_the_navy.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 5592 bytes
SHA-256: 5f1866bc0d7404e7d7d1be1c7e45152dc3befa56dda45afd39a6f533e2715f21
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 6576 bytes
SHA-256: e3c8baf596cd10afa8211f65f8f80797122165d7764d8530e85bae8edc851294
font_02_sfnt_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 11100 bytes
SHA-256: 2a55164e6ff47351ea2353b885c3d664ba187a3f32cb728dc1283cc4a08026af
font_03_sfnt_off00013f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2B 16168 bytes
SHA-256: dcc437beaabc532c244cb2402c7e187dabb6fccd34af89cd9e2270a2a4498d3d