Malicious PDF — malware analysis report

Static analysis result for SHA-256 de913ee1781c608c…

MALICIOUS

PDF

76.8 KB Created: 2021-04-03 23:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c0665e45e45eacf8c882753ca6e67a9c SHA-1: f86a4a4da5a6ed331da82917b7f492a68978d5c9 SHA-256: de913ee1781c608c4802eaf8042d9e1ffb1579459924f5bd4bed1d31f22905ed
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to external sites. The ML classifier strongly flagged this PDF as malicious. The primary malicious URL identified is https://mezovuduw.ru/award?keyword=boiler+control+systems+engineering+second+edition+pdf, which is presented as a lure for a technical document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/award?keyword=boiler+control+systems+engineering+second+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379045/normal_5fec1185a76dc.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/amma_amma_asai_amma_song_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_604509735f77b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_605817e19835d.pdfIn PDF document text
    • http://lokiraboxa.22web.org/61001782763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387424/normal_600731cd432e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofududegotu.epizy.com/godezuwazugufor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e523b6-db5f-42d2-8f69-2bdc00b7112c/funazagaxebujotetotizu.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/kikuweve.pdfIn PDF document text
    • http://maretazijedoval.epizy.com/wise_mans_fear_audiobook_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/new_music_albums_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/simoxaw.pdfIn PDF document text
    • http://zobotipuzadevi.epizy.com/99389057302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904419b5-3d19-4d0b-8a37-16854819c7d5/survival_gear_and_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/kindle_formatting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/nfl_schedule_excel_spreadsheet_2019_free.pdfIn PDF document text
    • http://tiwumuni.epizy.com/blur_background_image_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/mozilla_firefox_version_60_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8159dd2c-ed6a-405c-81ef-c3ce07346c75/4094548175.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_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 5416 bytes
SHA-256: 13f32b9b937d5a77746f10c81836110153adf2a179c20a35781980365fed5df5
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10432 bytes
SHA-256: b3a136f681bff706b232cd4bbdc3a722df2013e983f79875fcb1563431e0d47c

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