Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6dca5e49fcad29…

MALICIOUS

PDF

78.2 KB Created: 2021-03-06 11:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9199abe1bae648f337d1affe29bd5e03 SHA-1: 50b9bbb4402757dd03d4de4231196fb7412a99c1 SHA-256: cf6dca5e49fcad29f309102ee368509306a96d822642a53e5915d77d1102a644
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to distribute phishing content or malware. While no scripts were explicitly extracted, the PDF structure and extensive URL list strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=symbol+scanner+gun
    • https://cdn.sqhk.co/veleviziwew/Iihiaia/dufabafosimodoguvilolu.pdf
    • http://mandarin-fruit.space/sawabuvuxutez2zax1.pdf
    • http://iciapp.xyz/what_is_a_literature_review_research_paper6wrgr.pdf
    • https://cdn.sqhk.co/xavonepez/a5haljf/54680641663.pdf
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/5184150.pdf
    • https://cdn-cms.f-static.net/uploads/4487641/normal_602494dc50ad6.pdf
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/xodenaket.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_602169f056595.pdf
    • https://cdn.sqhk.co/wujejelot/bi9zNib/commodity_prices_corn_and_beans.pdf
    • http://raifaisentgo.online/santa_monica_coordinates_pokemon_gopu4zy.pdf
    • http://leyloften.online/letra_de_la_cancion_7_years_en_ingles_y_espaol0x3rm.pdf
    • http://dommasters.site/nopizaregay7jy2.pdf
    • https://cdn.sqhk.co/wifavizen/Ajdhhjc/play_talking_ben_dog_online_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_33a7e8a62f6b45f58560e8a739a23045.pdf?index=true
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_365a1fa54c814a8892d920bf27ec8007.pdf?index=true
    • http://tafujeloraxofo.epizy.com/where_is_bank_1_catalytic_converter.pdf
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_288ae40ec6194b8bb68cea7e23c65bae.pdf?index=true
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_2cec0ec66c8242728c4ac4dee3779549.pdf?index=true
    • http://tolimimagag.epizy.com/34369370837.pdf
    • http://wekidezeze.epizy.com/axial_wraith_kit_manual.pdf
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_197a6cd54da746a799af97dda349461f.pdf?index=true
    • 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_off0000f2bd.bin
d92616ef3bf2bde04591589bd4befa22ad88dc17707634cb62d1b0b1eaff6459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 5464 bytes
font_01_sfnt_off0001053e.bin
31e7d86307c93c8a8ef0cfef6da1df84f3cf81c60b1575efabb80136ca519752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 11724 bytes

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