Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde5cd13e11ea6ef…

MALICIOUS

PDF

81.8 KB Created: 2021-02-14 21:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4fc8b0df55fae07bd64ec82a61ead22 SHA-1: 7e481e89676c46a7c4f0106b8c5a4afccb7c866d SHA-256: dde5cd13e11ea6ef0a8073f7a91c66e4066278e8f0a877c26e86aae28949adce
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

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/aws?utm_term=daily+school+attendance+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467979/normal_5fe6542320969.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/ggihdyv/battle_arena_toshinden_3_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366032/normal_5fcfedae23e55.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/jdqv3Am/candyman_movie_2020_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60143cebd258b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_6007d8dfe598b.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/fgjifjd/waze_app_funny_voices.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404529/normal_6009236d45c4c.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/heohVR0/wekufebomebenusuxibiwolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450044/normal_5fce724eb34fa.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/hghbqgj/63709592682.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuvusu/hjihhYW/save_the_vip.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/2jhijjf/ny_company_outlet_store_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/NjaMPj0/762331649.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/gehEkgi/16582884696.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://kirigawegugava.epizy.com/wulanidoxagexomesofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/automobile_technology_class_9.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/57580994176.pdfIn PDF document text
    • http://sulifuzefusuw.rf.gd/video_show_editor_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/triple_bottom_line_reporting_examples.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/barovoromesa.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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 5036 bytes
SHA-256: 4f4582a751f77cce27383173dbaa63239d9ef37fd5e472890f734cae0446dad5
font_01_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 10984 bytes
SHA-256: 63fc8c9c509a41a189abbd11770cc04f9edc024898b9aed6c452e1ee8e13c3be
font_02_sfnt_off00012b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B71 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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