Malicious PDF — malware analysis report

Static analysis result for SHA-256 912618b43744a502…

MALICIOUS

PDF

75.8 KB Created: 2021-03-26 08:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d98d759644bb09387e8b2f5d154ac0f0 SHA-1: 590b95c916f9abed89bb65cf20e216eea98a66c1 SHA-256: 912618b43744a502fe471d8af52801fea367939a647b1b043a6363359185f51c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL is presented as an 'award' related to IELTS scores. This suggests a phishing or link-farming scheme designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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/award?keyword=ielts+listening+band+scores+pdf PDF link annotation
    • http://sujovageje.22web.org/rti_application_format_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/igeGge6/muwanov.pdfIn PDF document text
    • http://sikalaporaka.22web.org/chrysler_logo_in_vector_format.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/jgF5ibT/boponap.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/OHk9Hhh/birthday_cake_recipe_for_dogs_and_humans.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_f7a89819cc664353b3f7c0c2dd61ce28.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_75e9994571d54ee6b916d62746c2edac.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_fa9705d0744b4d5084eb8a40ee43197d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/story_of_seasons_doraemon_pc.pdfIn PDF document text
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_b743eb2ceba848cca911555b041f04a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satuja/25197297285.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_2a39b9bdc9644e469415d2cecd2dd6ee.pdf?index=trueIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_f3ad733f06914492a35fd404a4dcfca9.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_cfb31fedb9b04947bbcd0324e369c087.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_e7593a639247496689945cfad6586f08.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_3bd43f3a0ce445aa950efce2921a32f7.pdf?index=trueIn PDF document text
    • http://vufavaxotajoba.epizy.com/math_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/autocad_architecture_2015_tutorial_free.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_5dc6a1dcb11f4eada75577af1bf6c431.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_18ed1f2dbb3b4031b7ac512bd21cdb52.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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5400 bytes
SHA-256: 8d7cc4c6e12eac631fabda053421bf53241edfc48d000bc518947b850e32fb11
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 10608 bytes
SHA-256: 86de3c0a604cfdb7f1b3b9168f02eb4d4dfe4a9cd0e9c6ad53c88d111003c6ef