Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c489a1726cbdc1f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-15 10:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4894e93c9c7ed3587fc76154201dc9ce SHA-1: 74e443f9767603c9a1df7da432217cdf92515985 SHA-256: 6c489a1726cbdc1f07f654d7cab33db33d2b859af3199e81bca427761ae28e7b
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to download further payloads or redirect to phishing pages. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed for initial access via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/123?utm_term=gore+river+fishing+report
    • http://lumacy.site/111100539228cy6e.pdf
    • http://tvoyoproc.fun/99683289824on76s.pdf
    • http://wumokejo.iblogger.org/tolawixomisupuvijozux.pdf
    • http://hookup681.site/palugapuduhzc1d.pdf
    • http://rezonansmusic.com/xotubn1fkg.pdf
    • http://auto-fishing-rods1.club/zenogexifurbk254.pdf
    • http://domsale.xyz/cheat_sheet_statistics_rooawn.pdf
    • http://espaceclient-cmb.com/colour_hop_3d_gamebv836.pdf
    • http://sigefolaxapuve.22web.org/wd_my_cloud_mirror_gen_2_4tb.pdf
    • http://razvivatel.blog/the_following_information_is_available_for_birch_company_at_december_31gs19k.pdf
    • http://stonersfranchise.com/zidoxorusulidixigirofisa2e7ik.pdf
    • http://study-english-05.site/miracle_morning_affirmations_formulad39dt.pdf
    • http://asta-stroy.ru/83764385348w9ggd.pdf
    • http://phulop.store/gikidopuvetibofusoriluwe3jscd.pdf
    • http://poradoit1.site/mandated_vs_permissive_reporter_pan05jo.pdf
    • http://cabinetsop.xyz/xomofabezidaliguzariros863o.pdf
    • http://aviabileti.ru/paruxipezuselupavadbch19.pdf
    • http://gnoogle.site/74891099003rud6a.pdf
    • http://pogofefopi.22web.org/demonic_gorilla_guide_monkey_madness_2.pdf
    • http://safetymirrors.xyz/over_the_rainbow_piano_scoreq8qm1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://webenawawejoped.rf.gd/bootstrap_4_navbar_right_template.pdf
    • http://tupaguwojisese.rf.gd/add_splash_screen_android_studio.pdf
    • http://siwozegotu.rf.gd/hobart_4812_meat_grinder_parts_manual.pdf
    • http://duliwijedij.rf.gd/veginezilibowitaj.pdf
    • http://kofupugixujodin.epizy.com/discord_formatting_table.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f162.bin
490f4977ab9eaf317d533097af21c32bae309b28ad885b459437e99b16b9051c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5012 bytes
font_01_sfnt_off0001027e.bin
dfa1db53425bff4add2cfd600a7bdfcee925be1174fb36b08e217c8749c7f99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10512 bytes

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