Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4ef4ca68ad080…

MALICIOUS

PDF

78.8 KB Created: 2021-04-28 13:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 23b029c1da253742eef1ef656fd68f64 SHA-1: c42d51b5d3c9b3b72789af2114d6498bfd4f15ba SHA-256: 21a4ef4ca68ad080cec23152379bb34d4e11f55dad295d5a3c76cf4ff6e92a58
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a phishing or malware distribution scheme. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection further confirms this, identifying it as 'Pdf.Phishing.Trojan'. The file likely serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=do+skullcandy+hesh+2+work+with+xbox+one PDF link annotation
    • http://zinuginevero.22web.org/catalogo_de_cuentas_basico.pdfIn PDF document text
    • http://maroron.22web.org/apd_full_form_in_heart.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/if1naia/prank_call_voice_simulator.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/coleman_mach_rv_air_conditioner_shroud.pdfIn PDF document text
    • https://cdn.sqhk.co/jujuziwe/W0icgiu/servsafe_manager_practice_test.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/cafe_du_monde_new_orleans_menu.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/panoz.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/88341564187.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ijHgRrq/xidowalizosaxepizekowavaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molagegivijoxu.onlinewebshop.net/high_pressure_die_casting_defects.pdfIn PDF document text
    • http://gufobipadu.epizy.com/dalenevizafonano.pdfIn PDF document text
    • http://vutegug.epizy.com/10292321817.pdfIn PDF document text
    • http://rujamodi.rf.gd/what_language_cherokee_speak.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_78c3f1666eb6415da1488034881b39ef.pdf?index=trueIn PDF document text
    • http://tubiruk.epizy.com/asma_bronkial_2020.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/vegetarian_indian_recipes_snacks.pdfIn PDF document text
    • http://danudur.epizy.com/68568336073.pdfIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_ef057b5c7ed24e608388362cc25a0542.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_a09b6edf5c2c4b25bd7c1149a7324359.pdf?index=trueIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/kosetimusanuxafufi.pdfIn PDF document text
    • https://aaa8450b-5959-4376-bf95-5e5e4b45aab3.filesusr.com/ugd/bcfc74_2bb7ba0513ad4f9a90870937e8ea2c54.pdf?index=trueIn 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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 5624 bytes
SHA-256: e4fc76dd400d45fe26fb986e97590468a195bfff664dfb0d51a0823a0f96c8dd
font_01_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 11900 bytes
SHA-256: b147411645114e20c30d05a8e32ca0189908500ea804fd25cbb34425c1e25d47

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