Malicious PDF — malware analysis report

Static analysis result for SHA-256 547cbd53290a0015…

MALICIOUS

PDF

71.6 KB Created: 2021-04-07 20:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bf666ea9531d038d05d19c3d0a88cf63 SHA-1: 21dd1f78691441aa92c21f5297876ea40cf1a57c SHA-256: 547cbd53290a001552be3bfffb4ff04141deab47cee1657b30eec32339c07806
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are the primary indicators of compromise, likely leading to further malicious sites or downloads.

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://druttle.ru/strik?utm_term=garmin+nuvi+1390+battery+replacement PDF link annotation
    • http://bufibinokurun.scienceontheweb.net/healthcare_quality_assurance_manual.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/yellow_chords_ukulele.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/55449228476.pdfIn PDF document text
    • http://jabobafom.iblogger.org/bacaan_maulid_barzanji.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/jovebazijotasim.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/0ab5c48a-4019-4218-a234-eb5fb2e5d758/zte_warp_elite_qlink_wireless.pdfIn PDF document text
    • http://wujawejibizub.epizy.com/jeep_wrangler_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150a5d9a-a5a6-4d54-8016-7f88addafa6d/problemas_de_porcentajes_1o_eso_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1a0d5b-c685-41a0-b458-5fa86c840620/meruwuvi.pdfIn PDF document text
    • http://gumavefuve.rf.gd/l_adjectif_qualificatif_attribut_et_pithte.pdfIn PDF document text
    • http://limuzer.atwebpages.com/marketing_campaign_definition.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_9f61beaadc284bafac601c12a6cb439b.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_99099acb2d5a4aa3b0faa45add7901b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac852e6f-c5fe-45d2-a8c2-6afcad4de707/wogenowesa.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_612d5adefa75462b93a4cb60e6b7b733.pdf?index=trueIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_5d04d7e358e84553abedb67b3afeace6.pdf?index=trueIn PDF document text
    • https://bc13a564-db4d-4abe-bba9-081b1c4085ef.filesusr.com/ugd/d5ec75_cecd6681ee9440538003db74125dbae0.pdf?index=trueIn PDF document text
    • http://winefop.epizy.com/conjunction_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee3f50b-e9ca-4849-aed3-a02b0c324dd8/how_to_reference_online_journal_articles_in_apa_format.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_80f9eaeb3bc94dc09f0a456ccd1d33f7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 5748 bytes
SHA-256: 465f7fe3e399dd20367ab97c15d04164aabdd8ab7cf7767a2e833b8dec20c83b
font_01_sfnt_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 10724 bytes
SHA-256: 9be23537148f863a2c3e2e2b5dfa267c40d7ca7acb50e1fda245244903470b11