Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc2c14b32d01b10…

MALICIOUS

PDF

69.7 KB Created: 2021-03-29 10:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: deb142444d93c4652b66b90652c31a7e SHA-1: c1719b3ea0d347b452efdf9940ad0624e5cdfaee SHA-256: bbc2c14b32d01b10f5caa6fe0d3d586dede486313d9f677366fee8546d079f62
186 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 0.9998

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/award?keyword=yellow+coldplay+bass+tab+pdf PDF link annotation
    • http://ruwaxidalemib.iblogger.org/convert_base64_to_blob_javascript.pdfIn PDF document text
    • https://cdn.sqhk.co/fojizejoxu/fijqjij/vovubibibawuzexi.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/airtel_dth_new_plans_2020_list.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/gk_capsules_2020.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/graco_agitator.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/jKhggfi/powirarawon.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/devafaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_bc4e5b9fd44a45f482155c6895d07b43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cefa42f-b634-44b2-8931-ddc5e516b77d/37138330001.pdfIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/introduction_to_automobile_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c4fa8c-fe48-4df8-b36b-c3422bb733d7/where_can_i_donate_clothes_for_the_homeless_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648c16fb-d195-4fb1-b061-d16b36330504/sivunefuzegasolunewakuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b5a416-ba39-4427-933a-a858625dd02a/nijexodeteferagotuvobob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b13e597-ebe0-4d46-9a39-8eafda2f2f95/82380092460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7121b34b-a58a-4462-b7d1-3f98741cbe5a/94198289997.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_1dab10d14aea4e12bcb4fc9b011b0fa6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43324188-db53-469b-b85d-5369b209fe7c/86719272574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d43c390-5a01-43fb-8894-18abf1151af3/curso_de_marketing_digital_online_gratuitos_com_certificado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7978ace-19bc-4972-b6b6-f0fd03a6b1db/nelusanopewabejale.pdfIn PDF document text
    • http://zitilidi.rf.gd/caterpillar_to_butterfly_transformation_drawing.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 5348 bytes
SHA-256: 98be5eec7e3c84fa8ad6cbf5fd67450727b3e7d7ed0f76c2fdfb315ff91dcf55
font_01_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10332 bytes
SHA-256: 993aa1fe50dea684b07e1655a1af2bf813ed8da0320b09b13bd8475bb592f222