Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e6c05254dc1677…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 11:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dd14f80d9511876219f299812907644d SHA-1: 5e586e23df187388422c674e435c677334990421 SHA-256: b6e6c05254dc16779d216b4e42c044999a1823e132a25eca2ed741e4eddadccb
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The document contains numerous external links, many of which point to PDF files hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=download+bridal+chorus+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374188/normal_5ff828d464227.pdfIn PDF document text
    • http://leafester.online/25078341834nnyie.pdfIn PDF document text
    • http://sorekivobu.22web.org/wordpress_not_sending_new_user_registration_emails.pdfIn PDF document text
    • http://operationhomeplate.com/nelogiwujaliyb5qo.pdfIn PDF document text
    • http://2gusevshop.space/zumdahl_ap_chemistry_9th_edition_answers0wo32.pdfIn PDF document text
    • http://velesvoyage.ru/audit_report_writing_template6aeiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_601d08fa5ba03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_603e746f51dc6.pdfIn PDF document text
    • http://kemijejanurag.iblogger.org/rexagi.pdfIn PDF document text
    • http://vorecan.space/lojidetivizukezivomojonehzj7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fff97fe443b4.pdfIn PDF document text
    • http://chaptejvxz.fun/gikerabesakzh6q.pdfIn PDF document text
    • http://mon-cmso.best/what_was_the_us_constitution_written_forxoaak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_602302826cb57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fc6206cd44d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_602d0f1939837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_602f4a64d3912.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijukarevi.epizy.com/akinator_vip_apk_here.pdfIn PDF document text
    • http://xokowire.epizy.com/cloudy_sky_background.pdfIn PDF document text
    • http://vetoraj.rf.gd/5858429654.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_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 5472 bytes
SHA-256: 60609cb69ef974953e63f0fb7ce98aaedfe53b718f635eaaf85ff0cf33f03417
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 10484 bytes
SHA-256: b5340b33c73d6569eb8dcb02d6ccca4194165b07223494f18928b302211b1e4c

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