Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd1fd7920bb99ee…

MALICIOUS

PDF

74.7 KB Created: 2021-06-05 03:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 65d6fe1736be452f26f11c15ec92acad SHA-1: 221993a35325a8d8560cb3739d4bac8631594ee2 SHA-256: ebd1fd7920bb99eefde9008e0a3451d3e3fa48e4f6cb498262cf22ddf000bbdc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to jailbreaking, likely serving as a lure to encourage clicks on the embedded malicious URLs.

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 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://medvor.ru/pbw?utm_term=how+to+jailbreak+ios+6.1.6+no+computer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5ff1fabb29103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_604b82b5e698b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_60622acd474e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_60636989b2bae.pdfIn PDF document text
    • https://duxegolukazokun.weebly.com/uploads/1/3/1/3/131398215/feputesi_xukot_dojegez_rexitukuxebifu.pdfIn PDF document text
    • https://devejibotabakap.weebly.com/uploads/1/3/4/7/134702496/ragama-bazelesufam-fiwexusobido.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4484143/normal_60b24bbb35189.pdfIn PDF document text
    • https://dodivivedi.weebly.com/uploads/1/3/3/9/133997878/6852306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_60388c0d61154.pdfIn PDF document text
    • https://soxokelu.weebly.com/uploads/1/3/4/4/134494323/9e579950fac2.pdfIn PDF document text
    • https://defugelunek.weebly.com/uploads/1/3/4/5/134524545/68545328d46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426543/normal_6035b918597fd.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/mojas_vasirabixinunul_nejuvod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_60498b525ba08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gorixose.pbworks.com/f/resumen_del_libro_vigilar_y_castigar_por_capitulos.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144508107/super_smash_flash_2_unblocked_flash.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144630852/49046959888.pdfIn PDF document text
    • http://xovelezid.pbworks.com/f/68463001104.pdfIn PDF document text
    • http://kejuziz.pbworks.com/w/file/fetch/144593655/parallel_worlds_michio_kaku.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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 5652 bytes
SHA-256: d23de54784c409f329eb7e0f7c7d02dafa4ffaa86d369e42b3716b437f30e8ef
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10780 bytes
SHA-256: c1338c5b1ad4246431326173b6c6eb103f03883786239412a46e4bfe84a3b0d2

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