Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a4efd7ad242f97…

MALICIOUS

PDF

96.9 KB Created: 2021-03-19 09:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e5333b76f8beda6d8e6c94c3f6779aa SHA-1: 5cef8aac5941193e2eead151c52a22b08548ea16 SHA-256: d7a4efd7ad242f97afb8667542a7a4c55c6175d0c8ce72b4b9cfd85b191d9516
156 Risk Score

Malware Insights

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

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 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=assam+tet+2020+syllabus+in+assamese+pdf PDF link annotation
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/6625274.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/falabiputosox.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/biasing_of_bjt.pdfIn PDF document text
    • https://fuvobavan.weebly.com/uploads/1/3/1/6/131637325/nibutaposobo-juvawajakapiz.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/leten.pdfIn PDF document text
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/dutimoxetejov_xuribetofam.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/sidavagarabotiku.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/which_online_defensive_driving_course_is_best_in_texas.pdfIn PDF document text
    • https://sujozomamuv.weebly.com/uploads/1/3/2/6/132681492/tipopatebovezo.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/7cb4b6f913.pdfIn PDF document text
    • https://tunedewujanan.weebly.com/uploads/1/3/5/3/135345761/77d5f9.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/a75f144262d7a.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/nikon_coolpix_p520_manual_focus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goneduzum/bulletin_de_paie_maroc_excel.pdfIn PDF document text
    • http://gozuketitara.onlinewebshop.net/post_office_card_account_forgot_pin_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9a50c4-c5e5-4cc2-815c-b76fe7801543/wulinejikawosat.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/xurowisamufosogubirax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dab90f0-63d2-4dd6-b2e4-f5a070339063/jemuxodefipilutukik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aed47ce-5265-45ce-92fc-9230486f611e/92273141220.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/74873613704.pdfIn PDF document text
    • http://susabumo.atwebpages.com/interview_questions_and_answers_for_customer_service_representative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6216df2-2aa4-472f-9fbe-e0e34a5fdb74/furuxixevemidusokakosuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/water_pollution_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/5194113709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60cff79-b5db-402f-bcf7-1949ae16466e/south_carolina_dmv_permit_test_book.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/universal_glazing_bar_for_polycarbonate_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/sevogatiwitijivinikodax.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/canada_goose_size_guide_mens.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 5596 bytes
SHA-256: 025253bf4c60cf2eac3973be72d128ba0771de8030dc0e1f1f73b7065bf7fc35
font_01_sfnt_off000129d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D7 12644 bytes
SHA-256: 1584e1a0310f96ff5166a034ce29be79dbc58772b3c80ebeb82f3d63278df6ab
font_02_sfnt_off00015050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 10840 bytes
SHA-256: ff337941f29796d00cc50be119cb340e69c5dc7e95b7f8599753f92c02e82b77