Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffece41de83955c…

MALICIOUS

PDF

89.4 KB Created: 2021-03-18 02:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8b8fbd33a0567afce334acfa989e66f8 SHA-1: 548eeac8ccb6f17f90e9e7e367e40b3ead804328 SHA-256: 1ffece41de83955c54896b22fb460d0c96093bb969ecfa8dcbc12ffb6a44bc51
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 0.9992

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://bologen.ru/strik?utm_term=weight+limit+for+12+ft+skywalker+trampoline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412573/normal_602da151c1412.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/jhibNGe/automata_definition_and_pronunciation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_5fec7bf13208c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fe60df87d012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5fe1bf6b0d121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_603d746dd2bdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393020/normal_5fecbef86ec18.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/7lGGfhd/44542313229.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/jbjgFhb/hydro_dipping_film_suppliers_nz.pdfIn PDF document text
    • http://zesozejaja.22web.org/r._t._o._exam_question_papers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_6038e213a41e8.pdfIn PDF document text
    • https://cdn.sqhk.co/deliwewofok/YCVhaZe/warriors_orochi_characters_tv_tropes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_600bf380078fc.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/geicIYx/55364544213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5ff1915c715bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokumezex.epizy.com/bathukamma_songs_lyrics.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_adf63c04ebe14effbb7b30c3951faf96.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_7372d5c39a284d0e8f8572ceda770b2d.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_ae42e58902a04deeac95b0ccd619c866.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_df0bb72ed74d4860ab1b2a6102e0be0b.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_62c97067d0a141ab88000e48eab18694.pdf?index=trueIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_332b447310e74a309d0b736a2e2e636a.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_e243034fac3a42938bc76cad7c1dbd85.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_344fc528672d4b06b679b5330806fa68.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_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 5772 bytes
SHA-256: dc9699c177e1c4207005590b4ffb10018b9b6a6658a4e65503ebaabeb9c9a504
font_01_sfnt_off000131ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EA 11176 bytes
SHA-256: 1d750c696235429e26e2f2f30fa800548fcc34a301c9c4d4f8ccf6f448a9c012

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