Malicious PDF — malware analysis report

Static analysis result for SHA-256 3415d2faf8768a33…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 15:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7660ecafeaa732c19a389ff034cd1052 SHA-1: e0f4d121efc2c61cfbec069b23f5245fd2ff4471 SHA-256: 3415d2faf8768a3316de61a0cda5fa07564a95d5624fb2b02faee6839c55d1aa
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=red+orchestra+2+rising+storm+gameplay
    • http://coupons2020.info/is_introduction_to_psychology_hardoiam8.pdf
    • http://bu-markett.com/python_strategy_pattern_runtimehk0up.pdf
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdf
    • http://elinekici.online/98289943694yst3x.pdf
    • https://cdn.sqhk.co/vowibesep/ohjJYic/metaphysics_essay_examples.pdf
    • http://sdek-24.cc/2011_dodge_avenger_tire_size_p225_50r18_luxa4c2f.pdf
    • http://sokolov.fun/the_power_of_now_eckhart_tolle_audiobookrz96p.pdf
    • http://fakaripeti.xyz/sivawofasarowetohk0vt.pdf
    • http://allrecipes.pro/19443090975n45ty.pdf
    • http://flebolog24.com/how_to_setup_a_universal_remote_to_a_tcl_tvpc6wy.pdf
    • http://idealslim-ordina.site/how_much_does_a_log_house_kit_cost9yg8r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_ddf55e23e1d745dba4e028b6af6f4b1f.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_36baea38c75541a2bbd62fa4a2af142b.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_381d886351bb41e0b323e33f6682cc19.pdf?index=true
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_4db0463fe78a4532832df57e009ddcb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ee22307-6aa9-4487-b4e7-076a7549185d/android_app_development_software_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e860f1cd-5cdf-4b68-ac3c-f30b0b0bd568/el_pollo_loco_menu_megamall.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_d72f28fd5cc44051b406b3fcddb6f5c1.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_off0000f52d.bin
23872f6682eacf85dc2c1120742653492cba6e1cc681711d9bca342ee49faf6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 5728 bytes
font_01_sfnt_off00010893.bin
b865578e0f456dc0d4e9c9d39af9137fe08cbd9f92a6e62ed0a67e2952aff84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 11780 bytes

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