Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95a2db5d3a694ca…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 00:10:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f3c13bad08a790ba88db722eab0378ed SHA-1: bed11ff6713005732c67b26a0023d1fe92258ac5 SHA-256: e95a2db5d3a694ca0f5b5ad8d1b3256faa0707b8cb4c865725ab137151f32904
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the PDF's structure and embedded URLs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://soxebez.ru/strik?utm_term=etica+para+amador+capitulo+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fc8c7b247ab1.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/gzH9X3S/sonic_boom_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/3XFoTD1/tapowezisesupejagutuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tabotewo/WYjhYap/fojore.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/Ojfe2ib/balloon_dog_toy_reviews.pdfIn PDF document text
    • http://trenketo.buzz/3_bit_full_adder_verilog_codeu52bl.pdfIn PDF document text
    • http://forsage.pw/pububabazidikuluwakuzimx3iw4.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/d01iiWy/74534033921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5fd650b8a7f24.pdfIn PDF document text
    • http://frankkyko.com/x-_wolf_testosterone_booster4ho0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48751bc-44f3-4c5c-896e-1e1673e13a39/adidas_employee_store_guest_pass_portland.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_ce22f396e54749988e0843069db1cbd8.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_c9fa76b45c2a400ca14619993183c8bc.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_94eedb7bdb4740ce90846cdf10026c6d.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_4d69b99885b7429a95d3d2d60b214d79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede53f3b-a91d-49fc-9978-f0d9770ec58d/ready_new_york_ccls_grade_7_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9498d10-4d12-4903-b13e-b7f7e3d9846a/lunutobofebedagide.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/wokazowebutegatoraxu.pdfIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_f818cf47c81f45fba7554b4acaca7f7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/dozaparepotegeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ccd430e-fdb5-4a76-ac56-4112d305ab3a/ego_lawn_mower_parts_diagram.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_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 5212 bytes
SHA-256: eb5260fe4ccdd77704fb71c987914b36f703fa2899d91735d474b032c81a54b2
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 12008 bytes
SHA-256: c6ec69e386620aac04a70d9a043cc491a5bab4cc240d0d2f7bec688cb6dd378e