Malicious PDF — malware analysis report

Static analysis result for SHA-256 998145e00acb7db4…

MALICIOUS

PDF

87.2 KB Created: 2021-04-09 23:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dbfcfbd9262b8fb11f08bf0dddb3c15d SHA-1: 4eeb1764bea0736ce9947c86ee7d41f682ae7079 SHA-256: 998145e00acb7db4e2c5aa6e838de2e460aaf2c296dc443f65ef0f7a2e3b73e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://mezovuduw.ru/strik?utm_term=the+princess+and+the+pea+movie PDF link annotation
    • http://nemugub.mywebcommunity.org/75448637460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_60381f1643073.pdfIn PDF document text
    • http://usesol.xyz/crysis_3_crackesub2.pdfIn PDF document text
    • http://bestita.space/wakowutikudipanakenardc14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_60665f4164f38.pdfIn PDF document text
    • http://kajipim.mypressonline.com/45247366354.pdfIn PDF document text
    • http://jakartapro.xyz/jivokutujonoms20sv.pdfIn PDF document text
    • https://cdn.sqhk.co/bedepekemat/MWI5ih6/red_rose_tea_bags_have_plastic.pdfIn PDF document text
    • http://ig-copyrightviolation.com/philips_avent_scf287_02_electric_4-in-1_steam_steriliserfdfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_601820ec66dd9.pdfIn PDF document text
    • http://powerpoint4you.ru/ampli_fender_mustang_3_v2_reviewusdtr.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_to_program_dish_hopper_54.0_remote_to_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Y4WRQai/netspot_wifi_analyzer_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/ge8jdLY/beach_soccer_world_cup_qualifiers_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/tipiwaxevoteganiwilozu.pdfIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_189f4abf78eb4236a14540a572d617ad.pdf?index=trueIn PDF document text
    • http://pogetowem.onlinewebshop.net/how_to_be_a_better_project_manager.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_dbab25c80a4f469ab4434611f3392002.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_348ceb8e9dd142f6843126642f83c2c8.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4d8da9618b5e411fbdfa6e67793a57f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/airtel_xtreme_for_android_tv.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_44e0ec6843044f77bdfa591123fb1e02.pdf?index=trueIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/zavuwakakegovifobuvimafiw.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/jkbose_date_sheet_12th_bi_annual_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/bubble_shooter_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/22079423782.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 5288 bytes
SHA-256: afb82a848f66b11a829f6cf7b40d47b62a4b26c2251d1f8846dae60956446705
font_01_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 11140 bytes
SHA-256: d9d2554794dc5f36828cfb4301b635553cd306dc11c75336ddc4222980498b60