Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8f1d600472b3f6…

MALICIOUS

PDF

86.8 KB Created: 2021-04-04 21:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37e3fcba7985256bdded0891342934dd SHA-1: 7b5847ce12ab5938c0d5353aaca4ba73a51af530 SHA-256: 8e8f1d600472b3f6b06089467e018e36b47f8232c769315215a7c7b52442331d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://soxebez.ru/123?utm_term=hokkaido+weather+japan+guide
    • https://cdn-cms.f-static.net/uploads/4426262/normal_6051b40d1a000.pdf
    • https://zikivunebek.weebly.com/uploads/1/3/5/9/135964247/rudovagoxisomu.pdf
    • http://zanibajawin.iblogger.org/keurig_model_k40_water_reservoir.pdf
    • https://cdn-cms.f-static.net/uploads/4410694/normal_6039f3b8842bb.pdf
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/guvas-xefonizozi-xepinivuj-pizela.pdf
    • https://buwolipirawelas.weebly.com/uploads/1/3/0/8/130874522/2263625.pdf
    • http://finipupote.mywebcommunity.org/how_to_get_rid_of_a_cystic_pimple_before_it_surfaces.pdf
    • http://jidokove.scienceontheweb.net/90113856542.pdf
    • http://tuwimig.scienceontheweb.net/wofuj.pdf
    • https://nerutaraludu.weebly.com/uploads/1/3/4/6/134672403/liroruvufuguroz-sazogibita.pdf
    • http://lebuvowune.getenjoyment.net/suxoziseraxu.pdf
    • https://static.s123-cdn-static.com/uploads/4366346/normal_5ffe8986c3ab1.pdf
    • http://didazema.mypressonline.com/what_book_do_you_read_after_the_last_olympian.pdf
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fe8ceb71279a.pdf
    • http://zexawabezazojot.sportsontheweb.net/50638115570.pdf
    • http://medazuxa.mywebcommunity.org/guvaxenonuvujiviwusoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nemebikox.epizy.com/94924323750.pdf
    • http://simipibenafar.epizy.com/82263312726.pdf
    • http://najufijipavavot.rf.gd/bikers_kental_2_720p.pdf
    • http://gozidonozali.myartsonline.com/alastair_reynolds_short_stories.pdf
    • http://megomosapexar.epizy.com/25559820125.pdf
    • http://mifotabelimudon.myartsonline.com/relekekes.pdf
    • http://lizaduguxo.epizy.com/carnatic_music_notation_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ef.bin
36788152ad696fa7e3281cbb5bcfa9d23d35aa254e45d599b7b5528290068200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 3076 bytes
font_01_sfnt_off000100ea.bin
380bc18cdacd31930093ac14d0fe509ae9a754b5104bded0bd2f3967d012c2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EA 5204 bytes
font_02_sfnt_off000112ae.bin
69d05e6f48186b5bec65b82fc6960daaebfddf332a562391f758f7d976939072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 10584 bytes
font_03_sfnt_off0001372b.bin
f1e31015ed831e0316fd1e37e8dccbe211491f470648d696a0b5c7c671bfaa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 16300 bytes

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