Malicious PDF — malware analysis report

Static analysis result for SHA-256 d136e7dd80d67016…

MALICIOUS

PDF

76.8 KB Created: 2021-05-11 04:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e076497ca5ba0e825b1f1d8ac1db108a SHA-1: 23bb24cb961df965fe6cb0883bd6062cd0287267 SHA-256: d136e7dd80d670168094dad591966972d290c1df3b45983f1b4625f93341d611
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or redirectors, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm heuristic indicates an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=antigone+greek+tragedy+pdf PDF link annotation
    • https://cdn.sqhk.co/japedovak/hjian7u/sports_connection_charlotte_nc_ballantyne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_5fd63156c86c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491426/normal_6032391889893.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/gRqtPhe/44160769863.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/29908386378.pdfIn PDF document text
    • http://duduzojezojak.22web.org/gitidipapuwesumiwewaved.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/jbXhjgf/banarubamasugamu.pdfIn PDF document text
    • http://newizigidej.22web.org/90962422014.pdfIn PDF document text
    • http://wugopugulo.22web.org/surah_yasin_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_60599de23cdd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_606cf5136409b.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/cutting_edge_3rd_edition_elementary_student_s_book.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/iigiL6D/maxuwuxavesi.pdfIn PDF document text
    • http://vegixojarek.iblogger.org/english_story_books_with_tamil_translation.pdfIn PDF document text
    • http://donenebexoxisik.22web.org/8184811458.pdfIn PDF document text
    • http://wupuluku.22web.org/pejenevoxajiduxosufolad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_605ccc03b4e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/ifhiL29/55849142767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pafafobovixezat.epizy.com/jezirogatepax.pdfIn PDF document text
    • http://gedobesixo.epizy.com/converter_to_dwg_autocad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEA 4944 bytes
SHA-256: 97ecd33691f1c8014e351553a679ae269f7ea01720bf954a020def52fd598728
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 23164 bytes
SHA-256: 26f31e32ab77f67dfea8c1288a61fab970d7a53e8efd6b04360e062e4e982161
font_02_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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