Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b45ead8fd7c56da…

MALICIOUS

PDF

172.7 KB Created: 2021-04-04 18:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 493a4283c573c7ac47abd874447418ea SHA-1: cd968642a590484630c0bfb64d608cc9cc8fba2e SHA-256: 1b45ead8fd7c56da5d74c5f8ded6013dc1d9807b5d06990ca6df930f0e4787b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xezojetit.ru/award?keyword=english+useful+phrases+conversation+pdf PDF link annotation
    • https://cdn.sqhk.co/nusideja/bjaiGVv/l_space_riri_jumpsuit.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/ieZxAhi/barber_shop_logo_maker_free.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/gerudad.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/26381340360.pdfIn PDF document text
    • http://pojuded.22web.org/91885951062.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/fIgggfO/generalized_anxiety_disorder_definition_psychology_quizlet.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/anemias_hemoliticas_pediatria.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/aggie_map.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/10198854767.pdfIn PDF document text
    • http://malarusexomobaf.22web.org/complete_biology_notes_for_ssc_cgl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofuxolisemaxim.epizy.com/teaching_grammar_articles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80ed2906-d1b7-4874-9f24-3b8dc3ca4526/netgear_n600_modem_router_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45018345-89af-4db9-9ff6-2b64367accb7/cinderella_story_book_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad077ad-3535-4309-a3c4-356d0f1e9967/tabanosamuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9414b8cf-3674-4c69-bd99-b2d6eb9342be/what_is_the_order_of_the_warrior_books_by_erin_hunter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab730f18-5f32-478b-88fe-8411eaa7626f/sejosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a5f64f-658f-42b9-8aa1-f206124180c9/87015307941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d09ad9e-f4cb-49ec-bf8c-dd3b4b305918/communication_principles_for_a_lifetime_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524ac75b-baef-4f16-ad88-d8e418585564/85177342540.pdfIn PDF document text
    • http://bekujefil.epizy.com/english_grammar_articles_worksheets.pdfIn PDF document text
    • http://xevupabiko.rf.gd/12859674450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33120828-5e0c-4e16-84ed-98989793bae1/canon_powershot_sx20is_webcam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50e9e48-ca30-4cfd-b4c7-bcd4d1d2899c/el_prncipe_maquiavelo_resumen_por_captulos.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_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 118180 bytes
SHA-256: 18ec269b8b065e3c577079633622a9dc1b3309ac2f7c43d741960d8fa41d471a
font_01_sfnt_off00024fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24FDD 5432 bytes
SHA-256: d29d277fd49120245b0373dc206471ba4d4fcc3d2f932f63c0d01df5ad5f0270
font_02_sfnt_off00026265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26265 12876 bytes
SHA-256: f7cfb61aaad857af5b3c4ecbafaf936fa5c39996de3ca9f1aa882a78ec169365
font_03_sfnt_off00028c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C4F 16316 bytes
SHA-256: 6d531518c93d5816851a6539d7df75a47bb8ea4780c85ed3770554e2de75365c