Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9102b550213e67e…

MALICIOUS

PDF

85.4 KB Created: 2021-03-27 10:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bd05b7ea29db95e135d6a8a6a2ec23c SHA-1: 728ef1d46d77e3b58100129ca192a1626ce11f78 SHA-256: b9102b550213e67e6c44e38f3ff6344950ffeef177f5bfbe5495f43bd964fbb0
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 0.9949

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 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://xajibur.ru/123?utm_term=happy+birthday+husband+gif PDF link annotation
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/8754470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5fc5efb2110fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_605534feab918.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/aghRRjb/winibedoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600f3c5104aa3.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/takuf-raxutamun-lisuwekuwido-vudujurupax.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/b7vjauH/75129184372.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/5431002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_603cb55f25eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fe7e756aaa6a.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/barriers_to_effective_communication_in_a_classroom.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxuzoxu/U4jajd3/828155191.pdfIn PDF document text
    • https://xetiwokew.weebly.com/uploads/1/3/4/7/134741649/9782895.pdfIn PDF document text
    • https://vigowumiluz.weebly.com/uploads/1/3/1/3/131398530/4192774.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/anti_tyrosinase.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/HhiYIsx/wedding_background_invitation_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/ZhaPo5r/new_rnb_music_free_mp3_download.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikijanux.atwebpages.com/blackstone_real_estate_partners_ix.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/57319145206.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/wind_chimes_sound_free.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_1e345f4b44154c3fa31fc578e4d8b917.pdf?index=trueIn PDF document text
    • http://xojudemavu.onlinewebshop.net/what_would_cause_the_transmission_not_to_engage.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/68214051597.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_d5a9ba5f964b4bb6b7e105a07f0691ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/birthday_invitation_design_templates_free.pdfIn PDF document text
    • http://vapewokadovusa.myartsonline.com/schengen_visa_application_form_france.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 2156 bytes
SHA-256: 721b4372b2e707cca7c679602c04e191c030a8190ea60f5ea54f92b166662dfd
font_01_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 5476 bytes
SHA-256: e51720e8ceb531023a841d1c16c55848bc68d8bd2a9dc5db56bb07f186e058d3
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 10700 bytes
SHA-256: 34dda76b8d07622350b568bd24fced5120a62a5038990352a8c78045db7bc530