Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cec3d60b06fe949…

MALICIOUS

PDF

82.6 KB Created: 2021-03-29 22:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9373a2fff44d9af520cede95460a4085 SHA-1: 97a07a3fa66e5ec1a9c7d7fabb814f013ad42f1e SHA-256: 8cec3d60b06fe9491a136efdbe6d2da2974a2f56e3fc18253768af26a642a99d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=kokate+english+speaking+books+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fd95b4a2f2a4.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/xijufupufakadiva.pdfIn PDF document text
    • http://prequester.online/parches_chenille_personalizados_parag3u4z.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/old_macdonald_had_a_farm_ukulele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fd0926f8c43c.pdfIn PDF document text
    • http://aduo5.online/5g_mobile_and_wireless_communication_technologynkb57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6031908da758c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_6027e2ffa4d58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_604f428d1cda0.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/equidad_de_genero_en_el_trabajo.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/xutabuvative.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/61447389772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/sogamavasur.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/top_business_analytics_masters_in_india.pdfIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_7290d93a6f3b45d5a5ff4b52b290b6b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/insert_animated_gif_into.pdfIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b0858840ab314d69a2c3c848e53ba435.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_50b2f02136964f70b041ba123f115c0d.pdf?index=trueIn PDF document text
    • http://xijewixevav.onlinewebshop.net/amar_asom_newspaper.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/dictionary_full_name_meaning_noah.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_664b78fd959344fcab030ee5c5355184.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5568 bytes
SHA-256: bdf6ef72f3a796e5629c8e93da8f164e6dead23e8108e574585660e1d8f20033
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 10832 bytes
SHA-256: 19190a46883c95da74406984c52bfb70c90bb015e4160518f1a8ed45063d75cf
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 6932 bytes
SHA-256: 5f1a3dc2328f00a05f422e8627ab584d957898f4a67e70d17f9acf68d84b13dc

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