Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bd3e87a9411e9c…

MALICIOUS

PDF

95.1 KB Created: 2021-03-02 21:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6ad3202fcba911bb1630121d8bfb239 SHA-1: da6c6555ef71b7ffef2886e6b79e1d4ed70147e9 SHA-256: e8bd3e87a9411e9cc0acbac5ba82b0173595b6024fcbae52c9df2346b96ea26d
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 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://gimoguvi.ru/123?utm_term=transition+words+examples+pdf PDF link annotation
    • https://cdn.sqhk.co/ragebobeb/jbggK6R/talking_tom_candy_run_android_gameplay.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/luvaxuleranemikemibu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/hf7jaja/56922337055.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/vhbqK4C/sudoku_medium_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fe3c94fd778a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452374/normal_5ff80ad71772e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5fc9a5e34a0d6.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/XiibNGQ/xuforeputivusi.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/fDdigAa/dominos_codes_2020_ireland.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389106/normal_5ff8a9a08d579.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/b8Lpj3r/50319600257.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/zibenoroduzuw/ramewawubidesinakudofabo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/card_games_s_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/56506030555.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/taxenigekixozukin.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/8690491503.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/is_vampire_diaries_age_appropriate.pdfIn PDF document text
    • http://bologipegokofi.epizy.com/hunger_games_mockingjay_part_3_trailer.pdfIn PDF document text
    • http://verepuremi.rf.gd/bharti_axa_life_insurance_application_form.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_off000137fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FE 5296 bytes
SHA-256: 0593db34664978a6da6bddbe537ffd9768e90ce1cad56ff66b09cb81461e026d
font_01_sfnt_off000149fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FE 10816 bytes
SHA-256: 1d2eb6d8e78e08ac5e0b7db95628384afe6a14336593ff6d239bece7d93479df

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