Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d3b640d2d3f64a…

MALICIOUS

PDF

87.2 KB Created: 2021-03-30 16:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a9bb7c5475e259f1edadbdac6f9c43ed SHA-1: 27d7063c0221af79f0c5d1cb9aa19cdadd54bdae SHA-256: 37d3b640d2d3f64a354987a8748e5618b323a07363d37ebec9ca32e57b29541d
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs and a heuristic firing for a 'SEO_DISPOSABLE_LINK_FARM', suggesting it's used to drive traffic or host malicious content. The presence of a 'DOWNLOAD_BUTTON' heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/award?keyword=b.+ed+cet+books+pdf+free+download PDF link annotation
    • http://vpntop.info/vodafone_speed_checkbtycy.pdfIn PDF document text
    • http://hackins.site/zf_8hp_transmissioni525p.pdfIn PDF document text
    • http://yozi.store/ginarirutiybpan.pdfIn PDF document text
    • http://xiguxivevov.sportsontheweb.net/banking_awareness_arihant_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5ff9d0cf181db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_602cdd3f4f44e.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/nubuzufemuno.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/seth_meyers_net_worth_2018.pdfIn PDF document text
    • http://immortal-sho.club/56153783335xvhmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_603bd9570a42d.pdfIn PDF document text
    • http://mediaverifiedbadge.com/47776302339ab0b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_603a283c34d1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fe3676614eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494889/normal_600eabac68f34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e661df90-5f1b-49fa-a528-bb9c7f8b5204/ponugawajopisitowovadu.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_fbe8d3a71aba4589b95c88b9913c2464.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5298f4d-e7a3-4911-830d-849755f6e2d1/behringer_inuke_nu6000_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df41d5a-22cd-454b-b38d-f77e7f985c17/48998853420.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_26613169b6b14c06a3271bb2e89742b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db717b0c-c566-4b22-8c9d-17f5f8ce1ebd/how_to_use_a_magellan_gps_315.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_40fa4f5064a149be9a7d9a6dfaf5f1be.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 5528 bytes
SHA-256: c2a7e0fbfcef3a7b003ba7b0aa273fabff1e44a361576bfdad2e1251abe95913
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11252 bytes
SHA-256: 7b2b6c9031cb96e5ed6b90d5b7ad540eae5d478427a855c5f569efbd3b198593
font_02_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2