Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dd3335070eebd0…

MALICIOUS

PDF

80.1 KB Created: 2021-03-20 23:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 86c07bc311bea8ce96290f5f2d405b6e SHA-1: 5fc3739986185a2363267e4da92e57daa6005429 SHA-256: 21dd3335070eebd02db36bc3946f77c07cb3f6e2e56ac45195879ac06ad21b7b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=jabon+de+azufre+sirve+para+las+manchas PDF link annotation
    • http://uablog.site/oxford_concise_medical_dictionary_free_downloadb76gh.pdfIn PDF document text
    • http://vinnipoh.space/nodizatoyyi9.pdfIn PDF document text
    • http://mydenverneighborhoods.com/331729878127mi09.pdfIn PDF document text
    • http://portkamesto.site/juxipewufrymjn.pdfIn PDF document text
    • http://websecurer.tech/unbreakable_movie_mp4_free2harq.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/j7gfjii/retujonisazapi.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/rajoweg.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/cbr_test_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_603f9021dcfbd.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxejelun/ijgiRFR/blackberry_9900_apps.pdfIn PDF document text
    • http://crysety.xyz/nelson_grade_11_physics_textbook_downloadbag5v.pdfIn PDF document text
    • http://sqrab.top/767994494206yyd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_600cc2c0c3604.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/does_dominos_do_gluten_free.pdfIn PDF document text
    • http://alteramaks.world/agent_tds_report_in_finacleg8l83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5fcc853497b3e.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/alloys_pogil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_52edc4805b1e4205b0e95e03cced1b52.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_a4663fd1564d49e89444217b1d063a31.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5632 bytes
SHA-256: 583c4f485d84762a9675e2966a14710b13079e5ab88a45ca43659b4fb9870241
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 11612 bytes
SHA-256: d8453ea81b2192d5b577a3f8aca91e2a4af5fbba991071e944dd7873d9f92e1a

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